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What is the opposite of doubtful?

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

Adjective
Opposite of not known with certainty
“Isn't it only fair not to ruin someone's name until it's definite that a crime was committed and the individual accused was indeed the culprit?”
Adjective
Opposite of feeling uncertain about something
“He was certain that he heard something breathing, heavy even breaths that were accompanied by a faint growl when it exhaled.”
Adjective
Opposite of not likely to be true or to happen
“It is likely that future interstellar explorers will have a wide range of new worlds to explore.”
Adjective
Opposite of tending to raise doubts or questions
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“I certainly do not yet concede that it actually exists, until this is proved to me by an indubitable argument.”
Adjective
Opposite of experiencing or showing doubt or skepticism
“They kindly allowed me to pay at a later date, which was very trusting of them.”
Adjective
Opposite of dangerously insecure or unstable
“Both Fresno and Ventura reported initial danger signs, but the problems have since been resolved, and they report their systems are now stable.”
Adjective
Opposite of confused or perplexed
“Zhang suddenly felt enlightened after hearing his sister's wise words.”
Adjective
Opposite of shady or suspicious in nature
“Such espionage pointed to something that was not quite open and aboveboard.”
Adjective
(of an argument or statement) Opposite of not seeming reasonable or probable
Adjective
Opposite of not supported or proven by evidence
Adjective
Opposite of wavering between different opinions or actions
Adjective
Opposite of doubtful or uncertain about a given topic
Adjective
Opposite of hesitant or uncertain in nature or approach
Adjective
Opposite of of doubtful authenticity or lacking authority
Adjective
Opposite of having a covert or obscure meaning
Adjective
Opposite of not giving hope of future success or good results
Adjective
Opposite of lacking in veracity, accuracy or truth
“She's my best friend and she vowed to me that she had received this intelligence from a reliable source.”
Adjective
Opposite of wildly exaggerated or improbable
Adjective
Opposite of failing to convince or persuade
Adjective
Opposite of improbable in the degree of likelihood
“They point out that there is often a high chance of an adverse event no matter what course is pursued.”
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