Top 58 Slang For Certain – Meaning & Usage

When it comes to staying up-to-date with the latest lingo, it can be a challenge to keep track of all the new terms that pop up. But fear not, because we’ve got you covered with a curated list of the most current and trendy slang for certain situations. Whether you’re trying to impress your friends or simply want to understand what the cool kids are saying, this list is sure to keep you in the loop. So sit back, relax, and get ready to level up your slang game with us.

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1. Definite

When something is certain or sure. It expresses a high level of confidence or conviction.

For example, “Are you going to the party?” “Definite! I wouldn’t miss it for anything.”
In a debate, someone might say, “It’s definite that climate change is caused by human activity.”
A friend might ask, “Are you coming to the game?” and you might reply, “Definite, I already bought my ticket.”

2. For sure

An emphatic way of expressing certainty or agreement. It means there is no doubt about something.

For instance, “Do you want ice cream?” “For sure!”
In a discussion about a movie, someone might say, “For sure, it’s one of my all-time favorites.”
A friend might ask, “Can you help me move?” and you might reply, “For sure, I’ll be there.”

3. Without question

When something is unquestionably true or certain. It emphasizes a strong belief or agreement.

For example, “Is she the best candidate for the job?” “Without question, she has the most experience.”
In a conversation about a controversial topic, someone might say, “Without question, everyone deserves equal rights.”
A teammate might say, “Is he the fastest player on the team?” and you might reply, “Absolutely, no one can catch him.”

4. Absolutely

An enthusiastic way of expressing certainty or agreement. It means there is no doubt or hesitation.

For instance, “Do you want to go on a road trip?” “Absolutely, I’ve been wanting to travel.”
In a discussion about a new restaurant, someone might say, “Absolutely, the food is amazing.”
A friend might ask, “Can you lend me some money?” and you might reply, “Absolutely, I trust you.”

5. Positively

When something is definitely true or certain. It conveys a strong affirmation or assurance.

For example, “Do you think it will rain tomorrow?” “Positively, the forecast predicts showers.”
In a conversation about a sports match, someone might say, “Positively, our team will win.”
A coworker might ask, “Can you finish the project on time?” and you might reply, “Positively, I’ve already made good progress.”

6. Undoubtedly

This term is used to emphasize that something is definitely true or certain. It expresses a high level of confidence in a statement or belief.

For example, “He is undoubtedly the best player on the team.”
A person might say, “Undoubtedly, she will succeed in whatever she sets her mind to.”
Another might assert, “The evidence is undoubtedly in his favor.”

7. Certainly

This word is used to express agreement or to confirm that something is true or will happen without a doubt.

For instance, “Certainly, I can help you with that.”
A person might respond to a question with, “Certainly, I will be there on time.”
Another might say, “Certainly, she is the most qualified candidate for the job.”

8. Sure thing

This phrase is used to express agreement or to confirm that something will happen or be done without a doubt. It is a more informal way of saying “certainly” or “absolutely.”

For example, “Can you pick up some groceries on your way home?” “Sure thing!”
A person might respond to a request with, “Sure thing, I’ll get right on it.”
Another might say, “Sure thing, I’ll make sure it gets done.”

9. Without a doubt

This phrase is used to emphasize that something is absolutely true or certain. It indicates a high level of confidence in a statement or belief.

For instance, “She is without a doubt the most talented singer I’ve ever heard.”
A person might say, “Without a doubt, he will succeed in his endeavors.”
Another might assert, “The answer is without a doubt, 42.”

10. Without fail

This phrase is used to indicate that something always happens or is done without exception. It suggests a high level of reliability or predictability.

For example, “He wakes up at 6 a.m. without fail every morning.”
A person might say, “She delivers outstanding results without fail.”
Another might assert, “The team without fail meets their deadlines.”

11. No doubt

This phrase is used to express absolute certainty or agreement. It emphasizes that there is no room for doubt or uncertainty in a particular situation.

For example, someone might say, “No doubt, she is the best candidate for the job.”
In a conversation about a sports team’s victory, a person might exclaim, “No doubt, they deserved to win!”
Another person might respond to a statement with, “No doubt about it, you’re right!”

12. Without a shadow of a doubt

This phrase is used to convey an unwavering belief or certainty in something. It emphasizes that there is absolutely no doubt or ambiguity.

For instance, someone might say, “Without a shadow of a doubt, he is guilty of the crime.”
In a discussion about a controversial topic, a person might assert, “Without a shadow of a doubt, climate change is real.”
Another might confidently state, “I can say without a shadow of a doubt that she is the love of my life.”

13. No ifs, ands, or buts

This phrase is used to emphasize that there are no conditions or exceptions to a statement or decision. It indicates that there is no room for argument or debate.

For example, a teacher might say, “You must complete your homework, no ifs, ands, or buts.”
In a workplace setting, a manager might assert, “Attendance is mandatory, no ifs, ands, or buts.”
Another person might declare, “I expect full commitment from you, no ifs, ands, or buts.”

14. Beyond the shadow of a doubt

This phrase is used to convey a high level of certainty or conviction. It suggests that there is no room for doubt or uncertainty in a particular situation.

For instance, someone might say, “He is guilty beyond the shadow of a doubt.”
In a conversation about a historical event, a person might assert, “Beyond the shadow of a doubt, it was a turning point.”
Another might confidently state, “I believe in my abilities beyond the shadow of a doubt.”

15. Surefire

This term is used to describe something that is certain or guaranteed to be successful. It implies a high level of confidence in the outcome.

For example, a person might say, “This plan is a surefire way to increase sales.”
In a discussion about a recipe, someone might say, “Follow these steps for a surefire delicious meal.”
Another person might recommend a product by saying, “This is a surefire solution to your problem.”

16. Guaranteed

This word is used to express a high level of certainty or assurance about something. It implies that there is no doubt or uncertainty.

For example, “I can guarantee that you’ll love this movie.”
In a sales pitch, a seller might say, “This product is guaranteed to improve your skin.”
A person might confidently state, “I guarantee I’ll win this game.”

17. Absolute

When something is described as “absolute,” it means it is considered to be true or valid in all circumstances, without any exceptions or conditions.

For instance, “That is an absolute lie!”
In a debate, someone might say, “The right to free speech is an absolute.”
A person might exclaim, “That’s the absolute worst idea I’ve ever heard!”

18. Positive

This word is used to express certainty or confidence in something. It indicates that there is no doubt or ambiguity.

For example, “I’m positive I left my keys on the table.”
When confirming plans, someone might say, “I’m positive I can make it to the party.”
A person might assert, “I’m positive that I saw a UFO last night.”

19. Unquestionable

When something is described as “unquestionable,” it means that it cannot be doubted or disputed. It is considered to be undeniable or indisputable.

For instance, “His talent is unquestionable.”
In a court case, a lawyer might argue, “The evidence presented is unquestionable.”
A person might state, “The importance of education is unquestionable.”

20. Undeniable

When something is described as “undeniable,” it means that it cannot be denied or disputed. It is considered to be true or valid without any doubt.

For example, “The impact of climate change on the environment is undeniable.”
In a relationship, one might say, “There’s an undeniable connection between us.”
A person might assert, “The beauty of nature is undeniable.”

21. Indisputable

Something that is indisputable is beyond doubt or argument. It is unquestionably true or valid.

For example, “The evidence presented in court was indisputable.”
In a debate, someone might say, “The facts are indisputable, and the numbers speak for themselves.”
A news article might state, “The study provides indisputable proof of the effects of climate change.”

22. Irrefutable

Something that is irrefutable cannot be disproven or argued against. It is impossible to refute or deny.

For instance, “The DNA evidence is irrefutable and proves the suspect’s guilt.”
In a scientific discussion, someone might say, “The theory is supported by irrefutable evidence.”
A lawyer might argue, “The witness’s testimony is irrefutable and contradicts the defense’s claims.”

23. Clear-cut

Something that is clear-cut is easy to understand or define. It is uncomplicated and free from ambiguity.

For example, “The instructions for assembling the furniture were clear-cut.”
In a decision-making process, someone might say, “The answer is clear-cut: we should choose option A.”
A teacher might explain, “The rules for this assignment are clear-cut and leave no room for interpretation.”

24. Concrete

Something that is concrete is specific, tangible, or real. It is not abstract or theoretical.

For instance, “The project requires concrete evidence to support the claims.”
In a conversation about plans, someone might say, “We need to come up with concrete steps to achieve our goals.”
A scientist might state, “The experiment yielded concrete results that support our hypothesis.”

25. Set in stone

Something that is set in stone is fixed or unchangeable. It cannot be altered or modified.

For example, “The deadline for submissions is set in stone; no extensions will be granted.”
In a discussion about plans, someone might say, “The schedule is set in stone, and we cannot deviate from it.”
A policy might be described as “set in stone” to indicate that it cannot be easily changed or overturned.

26. Fixed

This term is used to indicate that something is definite or certain. It implies that a decision has been made and will not change.

For example, “The date for the party is fixed, so mark it on your calendar.”
In a discussion about plans, someone might say, “Let’s meet at 6pm. It’s fixed.”
A person might confidently state, “I’m not changing my mind. My opinion on this matter is fixed.”

27. Established

This slang term conveys the idea that something is firmly established and not subject to change.

For instance, “The rules of the game are well-established.”
In a conversation about traditions, someone might say, “This tradition has been established for generations.”
A person might assert, “We have an established routine for our morning workouts.”

28. Confirmed

This term indicates that something has been verified or proven to be true. It implies that there is no doubt or uncertainty.

For example, “The meeting time has been confirmed.”
In a discussion about rumors, someone might say, “I can confirm that it’s true.”
A person might state, “I’ve confirmed the reservation for tonight.”

29. Decided

This slang term suggests that a decision has been made and there is no room for further debate or discussion.

For instance, “The team has decided on a new strategy.”
In a conversation about dinner plans, someone might say, “Let’s go to that new restaurant. It’s decided.”
A person might assert, “I’ve decided to pursue a career in medicine.”

30. Resolved

This term implies that a problem or issue has been resolved or settled in a satisfactory manner.

For example, “The conflict between the two parties has been resolved.”
In a discussion about personal goals, someone might say, “I’ve resolved to save more money this year.”
A person might state, “After much thought, I’ve resolved the issue and made a decision.”

31. Determined

This term is used to describe someone who is completely committed or resolved to achieving a goal or outcome. It implies a strong sense of determination and unwavering focus.

For example, “She was dead set on winning the competition and put in hours of practice every day.”
In a conversation about career goals, someone might say, “I’m dead set on becoming a doctor and will do whatever it takes.”
A person discussing their New Year’s resolutions might declare, “I’m dead set on getting in shape this year and will stick to my workout routine.”

32. Assured

To be “locked in” means to have a high level of confidence or certainty about something. It implies a sense of assurance or guarantee.

For instance, “After extensive research, I’m locked in on my decision to buy this car.”
In a conversation about a sports team’s chances of winning, someone might say, “With their star player back in the lineup, they’re locked in for a victory.”
A person discussing their career might say, “I’m locked in on this job opportunity and have already started preparing for the interview.”

33. Inevitable

When something is described as “bound to happen,” it means that it is unavoidable or certain to occur. It implies that the outcome is inevitable and cannot be prevented.

For example, “With their lack of preparation, failure was bound to happen.”
In a discussion about a relationship, someone might say, “If they don’t address their issues, a breakup is bound to happen.”
A person discussing a pending deadline might say, “With only a day left, missing the deadline is bound to happen if we don’t work overtime.”

34. Unavoidable

When something is described as “inescapable,” it means that it cannot be avoided or evaded. It implies that the situation or outcome is unavoidable and cannot be prevented.

For instance, “The consequences of their actions were unavoidable.”
In a conversation about a difficult decision, someone might say, “No matter what choice I make, regret is inescapable.”
A person discussing a natural disaster might say, “With the storm’s intensity, destruction was unavoidable.”

35. Incontestable

When something is described as “undeniable,” it means that it cannot be contested or disputed. It implies that the evidence or truth is irrefutable and cannot be argued against.

For example, “The facts presented are undeniable and support the conclusion.”
In a discussion about a scientific theory, someone might say, “The evidence is overwhelming and makes the theory incontestable.”
A person discussing their achievements might say, “My success is undeniable, and I’ve worked hard to reach this point.”

36. Unwavering

When something is unwavering, it means it is steady and unchanging. It can refer to a person’s beliefs, actions, or decisions.

For example, “Despite facing criticism, she remained unwavering in her support for the cause.”
A leader might say, “We need unwavering dedication from our team to achieve our goals.”
Someone might describe a reliable friend as “unwavering” because they are always there when needed.

37. Unmistakable

When something is unmistakable, it means it is easily recognized or identified. It is clear and obvious.

For instance, “Her unmistakable laughter filled the room.”
A person might say, “The unmistakable scent of fresh flowers filled the air.”
A teacher might point out, “The student’s unmistakable talent for art is evident in their work.”

38. Definitive

Definitive refers to something that is final or decisive. It is the ultimate answer or solution.

For example, “The definitive answer to the question was provided by the expert.”
A reviewer might say, “This book is the definitive guide to cooking.”
A scientist might state, “The definitive study on climate change has been published.”

39. Unquestioned

When something is unquestioned, it means there is no doubt or uncertainty about it. It is accepted or believed without hesitation.

For instance, “His unquestioned loyalty to his friends earned him their trust.”
A historian might say, “The unquestioned authenticity of the document confirms its historical significance.”
A parent might say, “My child’s safety is my unquestioned priority.”

40. Unarguable

When something is unarguable, it means it is beyond debate or dispute. It is a fact that cannot be disputed.

For example, “The evidence presented in court was unarguable.”
A critic might state, “The actor’s performance was unarguably the highlight of the play.”
A sports commentator might say, “His record-breaking achievement is unarguable proof of his talent.”

41. Unassailable

This term is used to describe something that is completely secure or cannot be attacked or criticized. It often refers to an argument or position that is so strong that it cannot be disputed.

For example, “Her evidence was unassailable, and she won the court case.”
In a debate, someone might say, “His logic is unassailable. There’s no way to refute it.”
A sports commentator might describe a team’s defense as “unassailable” if they haven’t allowed any points.

42. Unquestionably

This word is used to emphasize that something is absolutely certain or true, and there is no room for questioning or doubt. It indicates a high level of confidence in the statement or fact.

For instance, “She is unquestionably the best singer in the competition.”
A person might say, “The evidence unquestionably proves his guilt.”
When describing a remarkable achievement, someone might say, “That was unquestionably the greatest performance I’ve ever seen.”

43. Indubitably

Similar to “unquestionably,” this word is used to express absolute certainty or truth without any doubt or hesitation. It is often used to emphasize the speaker’s confidence in their statement.

For example, “He is indubitably the smartest person I know.”
A person might say, “The results of the experiment indubitably prove the theory.”
When describing an amazing feat, someone might say, “She is indubitably the most talented artist of her generation.”

44. Inevitably

This word is used to describe something that is bound to happen or occur, regardless of efforts to prevent it. It suggests that the outcome is certain and cannot be avoided.

For instance, “With their strong lineup, a victory was inevitably in their future.”
A person might say, “If you keep procrastinating, failure is inevitably going to happen.”
When discussing a natural disaster, someone might say, “In areas prone to earthquakes, tremors are inevitably a part of life.”

45. Assuredly

Similar to “unquestionably” and “indubitably,” this word is used to express absolute certainty or truth. It indicates a high level of confidence in the statement or fact, with no room for doubt.

For example, “He will assuredly win the award with his incredible talent.”
A person might say, “The company’s new product will assuredly revolutionize the industry.”
When describing a guaranteed outcome, someone might say, “If you follow this recipe, you will assuredly have a delicious meal.”

46. Beyond a shadow of a doubt

This phrase is used to emphasize that something is completely certain or true. It suggests that there is no room for doubt or uncertainty.

For example, “He is guilty beyond a shadow of a doubt.”
In a discussion about a controversial topic, someone might say, “The evidence supports my position beyond a shadow of a doubt.”
A person might confidently state, “I know, beyond a shadow of a doubt, that she will succeed in her career.”

47. Without hesitation

This phrase is used to indicate that someone is completely sure about something and does not need to think or consider before taking action.

For instance, “She agreed to help without hesitation.”
In a conversation about making a decision, someone might say, “If it feels right, go for it without hesitation.”
A person might say, “I trust him completely. I would follow his advice without hesitation.”

48. Undeniably

This word is used to emphasize that something is unquestionably true or certain.

For example, “His talent is undeniably remarkable.”
In a discussion about a popular movie, someone might say, “The film’s impact on pop culture is undeniably significant.”
A person might confidently state, “The evidence presented is undeniably compelling.”

49. Beyond doubt

This phrase is used to indicate that something is completely certain or true, with no room for doubt.

For instance, “Her dedication to her work is beyond doubt.”
In a conversation about someone’s abilities, someone might say, “His skills are beyond doubt.”
A person might confidently state, “The team’s victory was beyond doubt.”

50. Incontestably

This word is used to emphasize that something is completely undeniable or cannot be challenged.

For example, “Her expertise in the field is incontestably superior.”
In a discussion about a historical event, someone might say, “The impact of that event on society is incontestably significant.”
A person might confidently state, “The results of the experiment are incontestably accurate.”

51. Without reservation

This phrase is used to indicate complete certainty or confidence in something.

For example, “I can say without reservation that she is the best candidate for the job.”
In a discussion about a controversial topic, someone might say, “I support this decision without reservation.”
When expressing trust in someone, a person might say, “I believe in you without reservation.”

52. Beyond question

This phrase is used to emphasize that something is beyond doubt or question.

For instance, “His talent is beyond question; he is the best player on the team.”
In a debate, someone might assert, “The evidence presented is beyond question.”
When discussing a well-known fact, a person might say, “It is beyond question that the Earth revolves around the sun.”

53. Without equivocation

This phrase is used to indicate that there is no room for misunderstanding or uncertainty.

For example, “I can state without equivocation that the project will be completed on time.”
In a legal context, someone might say, “The suspect’s guilt is established without equivocation.”
When expressing a clear opinion, a person might assert, “I can say without equivocation that this is the best book I’ve ever read.”

54. Beyond dispute

This phrase is used to emphasize that something is beyond any disagreement or argument.

For instance, “The scientific evidence is beyond dispute; climate change is real.”
In a discussion about history, someone might say, “The outcome of the battle is beyond dispute.”
When expressing a widely accepted fact, a person might assert, “It is beyond dispute that smoking is harmful to health.”

55. Beyond any doubt

This phrase is used to emphasize that there is no doubt or uncertainty about something.

For example, “Her guilt is beyond any doubt; the evidence is overwhelming.”
In a court case, someone might argue, “The defendant’s innocence is beyond any doubt.”
When expressing confidence in a decision, a person might say, “I can proceed with this plan beyond any doubt.”

56. Beyond all doubt

This phrase is used to emphasize that something is completely certain and there is no room for doubt or uncertainty.

For example, “After reviewing all the evidence, it is beyond all doubt that he is guilty.”
In a discussion about a controversial topic, someone might say, “The scientific evidence is beyond all doubt, climate change is real.”
A person might declare, “I trust her beyond all doubt, she would never lie to me.”

57. Beyond any shadow of a doubt

This phrase is used to emphasize that something is completely certain and there is no room for doubt or uncertainty. It is a more formal version of “beyond all doubt”.

For instance, “The jury’s decision was beyond any shadow of a doubt, the defendant was found guilty.”
In a debate, someone might assert, “The facts presented leave no room for doubt, the theory is true beyond any shadow of a doubt.”
A person might confidently state, “I know beyond any shadow of a doubt that I made the right decision.”

58. Beyond the shadow of any doubt

This phrase is used to emphasize that something is completely certain and there is no room for doubt or uncertainty. It is a slightly different variation of “beyond all doubt”.

For example, “His skills are beyond the shadow of any doubt, he is the best player on the team.”
In a court case, a lawyer might argue, “The evidence presented proves his innocence beyond the shadow of any doubt.”
A person might firmly state, “I believe in my abilities beyond the shadow of any doubt, I know I can succeed.”