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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Adjective
Opposite of feeling uncertain about something
Adjective
Opposite of brought from far away
Adjective
Opposite of open to question or dispute
Adjective
Opposite of experiencing or showing doubt, sceptical
Adjective
Opposite of tentative, unsure, or slow in acting or speaking
Adjective
Opposite of written or spoken with a partisan, biased or prejudiced purpose, especially a controversial one
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 lacking ideas or inspiration
Adjective
Opposite of not giving hope of future success or good results
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