5
open to question(expression, adjective, idiom, uncertain, dubious)
5
puzzled(adjective, uncertain, hesitant, confused, unsure)
5
remote(adjective, dubious, unlikely, improbable)
5
risky(noun, adjective, weak, delicate, uncertain)
5
sardonic(adjective, person, shameless, negative emotions)
5
slippery(adjective, weak, delicate, uncertain, unstable)
5
sneaky(adjective, informal, shaky, dubious, unclear)
5
strange(adjective, unusual, fantastic, dubious, unexpected)
5
unconvincing(adjective, extraordinary, unreasonable, fantastic, dubious)
5
unthinkable(adjective, extraordinary, amazing, incredible)
5
wary
5
weak(adjective, great, extraordinary, uncertain, anxious)
5
world-weary(adjective, person, shameless, negative emotions)
5
worried(adjective, uncertain, negative, anxious, nervous)
4
apocryphal(adjective, fake, uncertain, dubious, questionable)
4
difficult(noun, adjective, tricky, sticky, challenging)
4
distracted(adjective, uncertain, hesitant, unsure, believing)
4
erratic(adjective, unusual, strange, vague, dubious)
4
farfetched(adjective, unreasonable, dubious, suspect, shady)
4
fearful(adjective, weak, uncertain, anxious, nervous)
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APASmart Define. (2016). doubtful thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/doubtful/thesaurus/synonyms
ChicagoSmart Define. 2016. "doubtful thesaurus" https://smartdefine.org/doubtful/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, doubtful thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/doubtful/thesaurus/synonyms>.
MLASmart Define. "doubtful thesaurus" 24 March 2016. Web. 23 September 2026. <https://smartdefine.org/doubtful/thesaurus/synonyms>