| false(adjective, untrue, inaccurate, mythical) | |
| hairy(noun, adjective, delicate, uncertain, unstable) | |
| hard to believe(expression, adjective, idiom, unbelief doubt) | |
| impossible(adjective, extraordinary, unreasonable, amazing, dubious) | |
| inhibited(adjective, feel doubt) | |
| introverted(adjective, feel doubt) | |
| irrational(adjective, unusual, strange, uneven, unbalanced) | |
| marginal | |
| open to doubt(expression, idiom, uncertain, dubious, astonishing) | |
| peculiar(adjective, unusual, strange, dubious, suspect) | |
| perilous(adjective, delicate, uncertain, unstable, unsettled) | |
| perplexing(dark, uncertain, mysterious, unclear, indistinct) | |
| question | |
| refutable | |
| retiring(adjective, feel doubt) | |
| self-conscious(adjective, feel doubt) | |
| sensitive(adjective, weak, delicate, uncertain, unstable) | |
| suspecting | |
| timorous(adjective, feel doubt) | |
| tottery |
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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> |