Synonyms|330Antonyms|107|Broader|4Narrower|0Related|201
5
dubious(adjective, adverb, clear, honest, doubtful)
4
uncertain(adjective, adverb, indefinite, unmistakably, perceptibly)
3
unlikely(adjective, adverb, indefinite, unmistakably, possibly)
2
questionable(adjective, adverb)
1
in a way
1
indecisive
1
indefinite(adjective, adverb, unmistakably, authentically, indisputably)
1
unsure
0
apocryphal(adjective, fake, questionable)
0
doubtedly
0
doubtful
0
improbably
0
abstruse
0
absurdly
0
alleged
0
allegedly
0
amazingly
0
ambiguous
0
ambiguously
0
believably
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APASmart Define. (2015). doubtless thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/doubtless/thesaurus/antonyms
ChicagoSmart Define. 2015. "doubtless thesaurus" https://smartdefine.org/doubtless/thesaurus/antonyms (accessed September 21, 2026).
HarvardSmart Define 2015, doubtless thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/doubtless/thesaurus/antonyms>.
MLASmart Define. "doubtless thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/doubtless/thesaurus/antonyms>