60 entries under questionable topic. ×

58
doubtful(noun, adjective, clear, open, great)
38
uncertain(noun, adjective, clear, open, rough)
30
suspicious(adjective, unusual, strange, uncertain, nervous)
26
unreliable(adjective, delicate, uncertain, true, nervous)
25
shady(adjective, unusual, strange, corrupt, uncertain)
21
unsure(adjective, clear, open, rough, delicate)
20
debatable(noun, adjective, open, uncertain, doubtful)
20
suspect(verb, adjective, great, extraordinary, uncertain)
17
fishy(adjective, great, extraordinary, unusual, strange)
17
undecided(noun, adjective, open, certain, doubt)
17
ambiguous(adjective, clear, open, rough, delicate)
16
disputable(noun, adjective, open, uncertain, doubtful)
16
indefinite(adjective, open, obscure, rough, uncertain)
16
problematic(adjective, clear, open, rough, delicate)
15
unsettled(noun, adjective, open, rough, delicate)
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
shaky(adjective, delicate, uncertain, nervous, unstable)
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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>