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What is the opposite of sure?

Need antonyms for sure? Here's a list of opposite words from our thesaurus that you can use instead.

Adjective
Opposite of completely confident that one is right
“There were lots of times when people were very uncertain about the situation there.”
Adjective
Opposite of having confidence in doing or achieving something
“Brady was nervous about returning to the field after injuring his ankle in the first half of the game.”
Adjective
Opposite of true beyond any doubt
“Whether subsequent antibiotic treatment will benefit these patients is debatable.”
Adjective
Opposite of showing confidence or assurance
“Tommy was still a little unsure on his feet but was determined to limit his time in his old familiar wheelchair.”
Adjective
Opposite of able to be relied on or trusted
“What a pity that Ms. Evans' information comes from such an unreliable source.”
Adjective
Opposite of certain or very likely to occur
“He looked at the damage and knew it was unlikely he could fix it without almost entirely remaking the robot.”
Adjective
Opposite of certain to happen
“Thousands of hours of consular time are spent picking up the pieces after easily avoidable accidents.”
Adjective
Opposite of capable of being trusted
“He was at least comforted that Markov had made the arrangements for the boat, the last dependable act of an otherwise undependable brother.”
Adjective
Opposite of always right or accurate
Adjective
Opposite of bound to happen
Adjective
Opposite of expressing something forcibly and clearly
Adjective
Opposite of fated or inevitable (that something happens or is the case)
Adjective
Opposite of incapable of going wrong or being misused
Adjective
Opposite of optimistic or positive, especially in an apparently bad or difficult situation
Adjective
Opposite of concerned with what is actually the case (based on facts)
“The Curmudgeon is a satirical column based on fictitious characters in a mythical village.”
Adjective
Opposite of able to be predicted or anticipated
Adjective
Opposite of conceited or confident in a bold or cheeky way
“She was modest and unassuming and an eloquent speaker on social and literary matters.”
Adjective
Opposite of certain to remain safe and unthreatened
“The almshouse was, therefore, a socially stigmatizing option as well as an unsafe setting for childbirth, because of the high risk of infection.”
Adjective
Opposite of having unconditional and enthusiastic support
“There was some grudging applause at the final curtain, but I got the feeling it was more for the sake of form, rather than actual enjoyment.”
Adjective
Opposite of extremely precise or accurate
“You can be fairly imprecise with your keywords and get good results.”
Adverb
Opposite of definitely, without a doubt
“Listening to all of what Ikhabot is sharing, even though it sounds bonkers to the kid's ears, it does somewhat makes sense.”
Adverb
Opposite of with absolute certainty or without doubt
Adverb
Opposite of in a manner that is incapable of being disputed or argued against
Adverb
Opposite of to a deep, complete, and intense extent
Interjection
Opposite of expresses agreement in the affirmative
No way! Not if my life depended on it!”
Interjection
Opposite of expresses consent to a proposition
No! That won't do!”
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