157 entries under dubious topic. ×
| odd(adjective, unusual, strange, irregular) | |
| rare(weak, unlikely, implausible, improbable) | |
| thick(adjective, great, extraordinary, amazing) | |
| thin(adjective, weak, great, extraordinary, unreasonable) | |
| ticklish(noun, adjective, weak, delicate, uncertain) | |
| unconfirmed(adjective, uncertain, shaky, vague) | |
| undefined(adjective, weak, dark, uncertain, dim) | |
| unreasonable(adjective, unlikely, flimsy, unbelievable) | |
| unsubstantial(extraordinary, unreasonable, amazing, unlikely) | |
| betwixt and between(expression, idiom, open, uncertain) | |
| cockamamie(extraordinary, amazing, astonishing, incredible) | |
| cockeyed(extraordinary, amazing, astonishing, incredible) | |
| faint(unsettled, unclear, hazy, indistinct) | |
| fickle(adjective, weak, uncertain, sensitive, hesitant) | |
| flaky(extraordinary, unusual, strange, amazing) | |
| for the birds(expression, idiom, extraordinary, unreasonable) | |
| full of holes(expression, idiom, extraordinary, unreasonable) | |
| harebrained(extraordinary, amazing, astonishing, incredible) | |
| incogitable(extraordinary, amazing, astonishing, incredible) | |
| irregular(unusual, strange, vague, changeable) |
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| APA | Smart Define. (2016). doubtful thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/doubtful/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "doubtful thesaurus" https://smartdefine.org/doubtful/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, doubtful thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/doubtful/thesaurus/synonyms>. |
| MLA | Smart Define. "doubtful thesaurus" 24 March 2016. Web. 26 September 2026. <https://smartdefine.org/doubtful/thesaurus/synonyms> |