What is the opposite of certain?

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

Adjective
Opposite of having absolutely no doubt
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“They were uncertain as to whether it was the address of one of the suspects or a red herring.”
Adjective
Opposite of without question or definitely happening
“Much of this is eminently disputable, yet the result is constructive stimulation rather than mere provocation.”
Adjective
Opposite of unable to be avoided
“We will make a few suggestions here in an attempt to forestall readers from making avoidable mistakes.”
Adjective
Opposite of infallible or not very likely to fail
“How can you force these people to leave based on a fallible weather forecast?”
Adjective
(individual) Opposite of not explicitly named but specified indeterminately
“I would like to believe that the average person is more than likely to be respectful and good-natured.”
Adjective
(a few or many) Opposite of not explicitly named but specified indeterminately
“Surprisingly, the common people would eventually stop obstinately holding on to their misguided beliefs.”
Adjective
Opposite of known but specified in a general and nonexplicit sense
“He left seeking yet another unrecognized area of research.”
Adjective
Opposite of very likely or bound
“The likelihood of me trampling anyone as I walk down the street is highly unlikely.”
Adjective
Opposite of moderate in degree
“It may yet take a national inquiry to establish the full extent of this disturbing phenomenon.”
Adjective
Opposite of clearly defined or identified
“This room has no specific purpose and is just for general use.”
Adjective
(attributive) Opposite of feeling or exuding self-assurance
“They were insecure young men, who were led astray by a charismatic self-proclaimed prophet.”
Adjective
Opposite of clear and obvious in meaning or nature
Adjective
Opposite of expressing something forcibly and clearly
Adjective
Opposite of clearly apparent or capable of being logically proved
Adjective
Opposite of always successful
Adjective
Opposite of exact in correspondence or adherence to something; not allowing or admitting deviation or relaxation
“For the kids, the rules can probably be adhered to in a loose manner.”
Adjective
Opposite of existing in reality or as a matter of fact
“The premise that this was built by aliens is highly conjectural!”
Adjective
Opposite of occurring as natural consequence
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 used to single out a member, or members, of a specified group or class
“They've moved so far away from their identity and just have a general group of veterans who aren't all suited to the same style.”
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
Opposite of no danger present; unlikely to cause or lead to harm
“The building was old and unstable, and definitely not fit to live in.”
Adjective
Opposite of serving as conclusive evidence of something
Adjective
Opposite of displaying logic and common sense
“Her explanation for her bad behavior was completely illogical.”
Adjective
Opposite of capable or certain
Adjective
Opposite of unnamed or not identified by a name
Adjective
Opposite of optimistic or positive, especially in an apparently bad or difficult situation
Adjective
Opposite of plain or blunt
Adjective
Opposite of reliable or accurate from being based on facts
“He admits that the legends told about his life may have been exaggerated or fabricated.”
Adjective
Opposite of to an absolute degree
Adjective
Opposite of incapable of being reversed, recalled, repealed, or annulled
Pronoun
Opposite of some but not all
“I am confident that this new bill will be a net benefit to all.”
Determiner
Opposite of a certain proportion of, at least one
“I think it's safe to say that all people dislike being oppressed.”
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