What is the opposite of uncertain?

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

Adjective
Opposite of not completely confident or sure of something
“Quickly, he laced the rope between her legs, one over another, until he was certain the rope was tight enough.”
Adjective
Opposite of not known or definite
“The target area would be saturated, that was certain, but Erik doubted whether it would work or not.”
Adjective
Opposite of quick or likely to change consistently
“In other cases, a stable ecological balance may be upset by predation or other causes leading to unexpected species decline.”
Adjective
Opposite of occurring at uneven or varying rates or intervals
Adjective
(of a situation or problem) Opposite of having a high likelihood of becoming dire or turning into a crisis
“The patient has stabilized and is now safe.”
Adjective
Opposite of lacking certainty or decisiveness or unwilling to commit
Adjective
Opposite of tentative, unsure, or slow in acting or speaking
Adjective
Opposite of dangerously insecure or unstable
“The main section is more stable, though there are ongoing concerns over coastal erosion, further slippage, and subsidence.”
Adjective
Opposite of likely to have adverse consequences
“We don't need a stuntman for this scene as it is absolutely safe for you to perform yourself.”
Adjective
(of a visual or image) Opposite of blurry and not defined
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“He was a painter that specialized in still-life images that were clear and defined.”
Adjective
Opposite of unable to make decisions
“They have decisive, take-charge personalities in a society that shuns wishy-washiness.”
Adjective
Opposite of not likely to be true or to happen
Adjective
Opposite of being naturally susceptible to weaknesses or error
Adjective
Opposite of incapable of being put into one-to-one correspondence with the natural numbers or any subset thereof
Adjective
Opposite of not hopeful
Adjective
Opposite of obtained or achieved more by chance than skill
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