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
Adjective
Opposite of having confidence in doing or achieving something
Adjective
Opposite of true beyond any doubt
Adjective
Opposite of able to be relied on or trusted
Adjective
Opposite of certain or very likely to occur
Adjective
Opposite of impossible to avoid or evade
Adjective
Opposite of worthy of one's trust
Adjective
Opposite of having absolute certainty about something
“The board remains uncertain of his tenure as coach following a series of demoralizing losses.”
Adjective
Opposite of protected against discontinuance or change
Adjective
Opposite of lasting and not likely to experience any sudden changes or failure
Adjective
Opposite of concerned with what is actually the case (based on facts)
Adjective
Opposite of able to be depended or relied on
“Peter is an unreliable worker, and cannot be depended on to work autonomously from the team.”
Adjective
Opposite of impossible to avoid
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
Adjective
Opposite of having knowledge or perception of a situation or fact
“Jack was oblivious to the fact that Ursula was flirting with him.”
Adjective
Opposite of meeting the highest standard of accuracy
“You can be fairly imprecise with your keywords and get good results.”
Adjective
Opposite of certain to be or do something
Adjective
Opposite of having a greater-than-even chance of occurring
Adjective
Opposite of optimistic or positive, especially in an apparently bad or difficult situation
Adjective
(of an action, decision, etc.) Opposite of expected or sensible under the circumstances
“That was an unexpected reaction from such a mild-mannered child.”
Adjective
(informal) Opposite of truly meaning something said that was outrageous in nature
“I was kidding when I said I was going to going to go on a donut diet.”
Adjective
Opposite of displaying logic and common sense
“Her explanation for her bad behavior was completely illogical.”
Interjection
Opposite of used to give an affirmative response
Interjection
Opposite of used to express acknowledgment or acceptance
No, I won't agree to it!”
Adverb
Opposite of to a deep, complete, and intense extent
Adverb
Opposite of without doubt
Adverb
Opposite of in a manner that is incapable of being disputed or argued against
Adverb
Opposite of without question and beyond doubt
“We are unlikely to go on a holiday as we cannot afford to.”
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