60 entries under questionable topic. ×

12
indecisive(adjective, clear, open, delicate, certain)
12
dubitable(adjective, clear, certain, uncertain, anxious)
12
moot(noun, adjective, open, uncertain, doubtful)
12
unclear(adjective, clear, open, rough, certain)
10
arguable(noun, adjective, uncertain, doubtful, unsettled)
10
disreputable(adjective, uncertain, doubtful, unsettled, unpredictable)
9
indeterminate(adjective, clear, obscure, rough, certain)
9
insecure(adjective, delicate, uncertain, nervous, unstable)
9
open(adjective, uncertain, nervous, unstable, doubtful)
9
unstable(adjective, delicate, uncertain, nervous, dishonest)
8
controversial(noun, adjective, uncertain, hot, doubtful)
7
far-fetched(adjective, hard, uncertain, doubtful, unclear)
6
chancy(adjective, clear, delicate, certain, uncertain)
6
doubtable(adjective, uncertain, doubtful, unsettled, suspicious)
5
borderline(adjective, clear, open, delicate, certain)
5
clouded(adjective, clear, certain, uncertain, doubtful)
5
speculative(uncertain, doubtful, vague, unclear, unsure)
4
apocryphal(adjective, fake, uncertain, doubtful)
4
hazy(uncertain, doubtful, vague, unclear, ambiguous)
4
indistinct(adjective, rough, uncertain, doubtful, unsettled)
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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>