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
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“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 subject to dispute or questions
“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
Opposite of that cannot be conceived
Adjective
Opposite of embellished to the point of being false or untrue
“The riveting documentary tells a true story about the cutthroat world of gymnastics.”
Adjective
Opposite of tentative, unsure, or slow in acting or speaking
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 of doubtful authenticity, or lacking authority
Adjective
Opposite of deviating from what is considered normal
Adjective
Opposite of showing or feeling insecurity or uncertainty
Adjective
Opposite of used ironically to express the belief that something is unlikely or does not exist
“There is a likely chance of rain tomorrow.”
Adjective
Opposite of written or spoken with a partisan, biased or prejudiced purpose, especially a controversial one
Adjective
Opposite of wildly exaggerated or improbable
Adjective
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?”
Adjective
Opposite of prone to speaking evasively, indirectly, or duplicitously
Adjective
Opposite of not giving hope of future success or good results
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