157 entries under dubious topic. ×
| indecisive(adjective, clear, open, weak, delicate) | |
| obscure(adjective, rough, dark, uncertain, unreasonable) | |
| unclear(adjective, clear, open, obscure, rough) | |
| vague(adjective, clear, open, obscure, rough) | |
| shady(adjective, open, honest, unusual, strange) | |
| improbable(adjective, extraordinary, uncertain, fantastic) | |
| unlikely(adjective, slight, uncertain, shaky) | |
| unreliable(adjective, delicate, uncertain, nervous, unstable) | |
| borderline(adjective, clear, open, delicate, certain) | |
| incredible(adjective, great, extraordinary, unreasonable, fantastic) | |
| indistinct(adjective, obscure, rough, uncertain, dim) | |
| chancy(noun, adjective, clear, delicate, certain) | |
| implausible(adjective, extraordinary, fantastic, amazing) | |
| indeterminate(adjective, clear, obscure, rough, certain) | |
| mistrustful(adjective, uncertain, anxious, nervous, worried) | |
| problematical(adjective, clear, certain, uncertain) | |
| vacillating(adjective, weak, uncertain, nervous, shy) | |
| arguable(noun, adjective, certain, uncertain, unsettled) | |
| controversial(noun, adjective, uncertain, hot, unsettled) | |
| disreputable(adjective, dishonest, vague, unclear) |
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| APA | Smart Define. (2016). doubtful thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/doubtful/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "doubtful thesaurus" https://smartdefine.org/doubtful/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, doubtful thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/doubtful/thesaurus/synonyms>. |
| MLA | Smart Define. "doubtful thesaurus" 24 March 2016. Web. 25 September 2026. <https://smartdefine.org/doubtful/thesaurus/synonyms> |