41
dubious(noun, adjective, clear, great, rough)
38
doubtful(noun, adjective, clear, great, obscure)
35
uncertain(noun, adjective, clear, rough, honest)
27
debatable(noun, adjective, certain, uncertainty, uncertain)
26
disputable(noun, adjective, open, certain, uncertainty)
21
shady(adjective, honest, unusual, strange, corrupt)
21
suspect(verb, adjective, weak, great, honest)
20
moot(noun, adjective, certain, uncertain, doubtful)
19
unreliable(adjective, uncertainty, uncertain, true, dishonest)
18
problematic(adjective, clear, open, rough, certain)
17
arguable(noun, adjective, certain, uncertain, doubtful)
17
fishy(adjective, great, honest, informal, extraordinary)
17
suspicious(adjective, honest, unusual, strange, uncertain)
16
unsure(adjective, clear, rough, certain, uncertain)
15
controversial(noun, adjective, uncertain, hot, doubtful)
15
disreputable(adjective, uncertain, doubtful, unsettled, shaky)
15
untrustworthy(adjective, uncertainty, uncertain, dishonest, doubtful)
12
equivocal(adjective, clear, obscure, rough, honest)
12
iffy(adjective, clear, informal, certain, unreliable)
12
improbable(adjective, extraordinary, uncertain, doubtful, dubious)
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APASmart Define. (2015). questionable thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/questionable/thesaurus/synonyms
ChicagoSmart Define. 2015. "questionable thesaurus" https://smartdefine.org/questionable/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, questionable thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/questionable/thesaurus/synonyms>.
MLASmart Define. "questionable thesaurus" 13 April 2015. Web. 20 September 2026. <https://smartdefine.org/questionable/thesaurus/synonyms>