| fishy(absurd, unbelievable, implausible, preposterous, improbable) | |
| flimsy(absurd, unbelievable, implausible, preposterous, improbable) | |
| highly unlikely | |
| hopeless case(noun, impossibility) | |
| implausible(unbelievable, improbable) | |
| impossibility | |
| impracticable(adjective, possible) | |
| impractical(adjective, possible) | |
| incogitable(absurd, unbelievable, implausible, preposterous, improbable) | |
| insupposable(absurd, unbelievable, implausible, preposterous, improbable) | |
| irresoluble | |
| irresolvable | |
| nonstarter(noun, impossibility) | |
| not feasible | |
| phony(unbelievable, implausible, improbable) | |
| questionable(absurd, unbelievable, implausible, preposterous, improbable) | |
| rings phony(expression, absurd, unbelievable, implausible, preposterous) | |
| suspect(absurd, unbelievable, implausible, preposterous, improbable) | |
| thin(unbelievable, implausible, improbable) | |
| totally unlikely |
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| APA | Smart Define. (2011). out of the question thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/out_of_the_question/thesaurus/synonyms |
| Chicago | Smart Define. 2011. "out of the question thesaurus" https://smartdefine.org/out_of_the_question/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2011, out of the question thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/out_of_the_question/thesaurus/synonyms>. |
| MLA | Smart Define. "out of the question thesaurus" 24 May 2011. Web. 27 September 2026. <https://smartdefine.org/out_of_the_question/thesaurus/synonyms> |