10
unsteady(adjective, delicate, uncertain, unstable, doubtful)
9
incredible(adjective, great, extraordinary, unreasonable, amazing)
9
indeterminate(adjective, clear, obscure, rough, certain)
9
insecure(adjective, delicate, uncertain, nervous, unstable)
9
mistrustful(adjective, uncertain, nervous, doubtful, vague)
9
open(adjective, uncertain, nervous, unstable, doubtful)
9
sceptical(adjective, doubtful)
9
shifty(adjective, weak, corrupt, uncertain, dishonest)
9
unstable(adjective, delicate, uncertain, nervous, dishonest)
8
controversial(noun, adjective, uncertain, hot, doubtful)
7
crooked(adjective, false, corrupt, dishonest, deceitful)
7
doubting(adjective, uncertain, dishonest, unsettled, hesitant)
7
far-fetched(adjective, hard, uncertain, doubtful, unclear)
7
in doubt(expression, adjective, idiom, clear, certain)
7
irresolute(adjective, uncertain, doubtful, hesitant, unsure)
7
slippery(adjective, delicate, uncertain, unstable, dishonest)
7
trustless(adjective, uncertain, dishonest, doubtful, deceitful)
7
unbelievable(adjective, great, extraordinary, unreasonable, amazing)
7
wavering(adjective, open, uncertain, nervous, dishonest)
6
absurd(adjective, doubtful, ridiculous, improbable)
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APASmart Define. (2016). dubious thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/dubious/thesaurus/synonyms
ChicagoSmart Define. 2016. "dubious thesaurus" https://smartdefine.org/dubious/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, dubious thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/dubious/thesaurus/synonyms>.
MLASmart Define. "dubious thesaurus" 4 March 2016. Web. 22 September 2026. <https://smartdefine.org/dubious/thesaurus/synonyms>