165 entries under doubtful topic. ×

5
clouded(adjective, clear, certain, uncertain)
5
conjectural(adjective, vague, unsure)
5
inconceivable(adjective, extraordinary, unreasonable, amazing)
5
perplexed(adjective, uncertain, hesitant, unsure)
5
speculative(uncertain, vague, unclear, unsure)
5
tricky(adjective, weak, delicate, loose, uncertain)
5
unassured(adjective, uncertain, nervous, dishonest)
5
unbelieving(adjective, false, uncertain, dishonest)
5
unconvincing(adjective, great, extraordinary, unreasonable, amazing)
5
unresolved(adjective, open, uncertain, unsettled)
5
vacillating(adjective, uncertain, nervous, unsettled)
5
weak(adjective, great, extraordinary, uncertain, nervous)
4
ambivalent(open, vague, unsure, ambiguous)
4
apocryphal(adjective, fake, uncertain, questionable)
4
cryptic(uncertain, dishonest, vague, unreliable)
4
erratic(adjective, weak, unusual, strange, loose)
4
evasive(adjective, uncertain, dishonest, vague)
4
flimsy(adjective, extraordinary, unreasonable, amazing)
4
hazy(uncertain, vague, unclear, ambiguous)
4
indistinct(adjective, rough, uncertain, unsettled)
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APASmart Define. (2016). dubious thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/dubious/thesaurus/synonyms
ChicagoSmart Define. 2016. "dubious thesaurus" https://smartdefine.org/dubious/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, dubious thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/dubious/thesaurus/synonyms>.
MLASmart Define. "dubious thesaurus" 4 March 2016. Web. 26 September 2026. <https://smartdefine.org/dubious/thesaurus/synonyms>