14
incredulous(adjective, doubtful, skeptical, unbelieving)
14
equivocal(adjective, clear, open, rough, delicate)
14
obscure(adjective, rough, uncertain, unreasonable, doubtful)
14
undependable(adjective, uncertain, nervous, dishonest, doubtful)
13
iffy(adjective, clear, open, delicate, informal)
13
improbable(adjective, uncertain, unreasonable, doubtful, likely)
13
shaky(adjective, delicate, uncertain, nervous, unstable)
12
indecisive(adjective, clear, open, delicate, certain)
12
distrustful(adjective, uncertain, nervous, doubtful, unsettled)
12
dubitable(adjective, clear, certain, uncertain, anxious)
12
moot(noun, adjective, open, uncertain, doubtful)
12
skeptical(adjective, certain, doubt, uncertain, nervous)
12
unclear(adjective, clear, open, rough, certain)
11
hesitant(adjective, open, uncertain, nervous, doubtful)
10
implausible(adjective, great, slight, extraordinary, amazing)
10
in question(expression, adjective, idiom, clear, obscure)
10
arguable(noun, adjective, uncertain, doubtful, unsettled)
10
disreputable(adjective, uncertain, doubtful, unsettled, unpredictable)
10
fly-by-night(adjective, uncertain, nervous, dishonest, doubtful)
10
problematical(adjective, clear, certain, uncertain, doubtful)
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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>