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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.

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?”
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.”
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.”
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.”
Opposite of experiencing or showing doubt or skepticism
“They kindly allowed me to pay at a later date, which was very trusting of them.”
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.”
Opposite of confused or perplexed
“Zhang suddenly felt enlightened after hearing his sister's wise words.”
Opposite of shady or suspicious in nature
“Such espionage pointed to something that was not quite open and aboveboard.”
(of an argument or statement) Opposite of not seeming reasonable or probable
Opposite of not supported or proven by evidence
Opposite of wavering between different opinions or actions
Opposite of doubtful or uncertain about a given topic
Opposite of hesitant or uncertain in nature or approach
Opposite of of doubtful authenticity or lacking authority
Opposite of having a covert or obscure meaning
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.”
Opposite of wildly exaggerated or improbable
Opposite of failing to convince or persuade
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.”
Opposite of feeling or showing a resentful suspicion that one's partner is attracted to or involved with someone else
“Whilst I adore his easygoing nature, would it kill him to care at least a little?”
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