4
unimaginable(adjective, extraordinary, amazing, doubtful, unlikely)
4
unprincipled
4
unsafe(adjective, delicate, uncertain, unstable, dishonest)
4
unsavory
4
untrusty(adjective, false, uncertain, nervous, dishonest)
4
wary
4
weird(adjective, unusual, strange, irregular, odd)
3
agnostic(adjective, uncertain, hesitant, unsure)
3
bizarre(adjective, unusual, strange, fantastic, irregular)
3
contestable
3
curious(adjective, unusual, strange, odd, ridiculous)
3
deniable
3
dicey(adjective, delicate, uncertain, unstable, irregular)
3
diffident(adjective, uncertain, nervous, doubtful, hesitant)
3
dishonourable
3
eccentric(adjective, unusual, strange, fantastic, irregular)
3
enigmatic(uncertain, doubtful, vague, unclear, tricky)
3
fanciful(adjective, fantastic, doubtful, unlikely, implausible)
3
hazardous(adjective, open, delicate, uncertain, unstable)
3
in dispute
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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>