| unsound(adjective, shaky, uneven, unbalanced, unsteady) | |
| absurd(adjective, dubious, improbable) | |
| ambivalent(adjective, open, vague, unsure, ambiguous) | |
| anxious(adjective, uncertain, awkward, nervous, shy) | |
| apprehensive(adjective, uncertain, anxious, awkward, nervous) | |
| arbitrary(adjective, changeable, erratic, random) | |
| capricious(adjective, dubious, changeable, uneven, unbalanced) | |
| cautious | |
| confutable | |
| contestable | |
| crooked | |
| cryptic(dark, uncertain, dishonest, vague, dubious) | |
| dangerous(noun, adjective, delicate, uncertain, unstable) | |
| deniable | |
| devious | |
| dishonest | |
| disturbed(adjective, uncertain, awkward, shy, hesitant) | |
| dodgy(adjective, dishonest, dubious, unreliable, suspect) | |
| faithless(adjective, uncertain, hesitant, unsure, believing) | |
| fallacious(adjective, flimsy) |
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| APA | Smart Define. (2016). doubtful thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/doubtful/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "doubtful thesaurus" https://smartdefine.org/doubtful/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, doubtful thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/doubtful/thesaurus/synonyms>. |
| MLA | Smart Define. "doubtful thesaurus" 24 March 2016. Web. 23 September 2026. <https://smartdefine.org/doubtful/thesaurus/synonyms> |