| touchy(adjective, open, obscure, delicate, uncertain) | |
| treacherous | |
| tremulous | |
| unethical | |
| unforthcoming(adjective, feel doubt) | |
| unscrupulous | |
| unsupported(adjective, questionable, unsubstantiated, unconfirmed, uncorroborated) | |
| untrusting | |
| vacillate | |
| wishy-washy(adjective, open, weak, uncertain, indefinite) | |
| wobbly(adjective, weak, uncertain, nervous, sensitive) | |
| at issue(adjective, idiom, clear, certain) | |
| alleged | |
| Delphic(uncertain, nervous, insecure, unsure, self-doubting) | |
| beyond belief(expression, extraordinary, amazing, incredible) | |
| blurred(unclear, hazy, indistinct, indistinguishable, blurry) | |
| chance(adjective, changeable, erratic, random) | |
| confusing(uncertain, vague, unclear, ambiguous, misleading) | |
| contentious(dubious, questionable, provocative, debatable, debated) | |
| contested(adjective, certain) |
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| APA | Smart Define. (2016). doubtful thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/doubtful/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "doubtful thesaurus" https://smartdefine.org/doubtful/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, doubtful thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/doubtful/thesaurus/synonyms>. |
| MLA | Smart Define. "doubtful thesaurus" 24 March 2016. Web. 24 September 2026. <https://smartdefine.org/doubtful/thesaurus/synonyms> |