- Definitions|1
- Thesaurus|686
- Abbreviations|0
| chance in a million | |
| closed-out | |
| cockamamie(extraordinary, amazing, incredible) | |
| cockeyed(extraordinary, amazing, incredible) | |
| contraband | |
| curious(extraordinary, unusual, exceptional, marvelous, special) | |
| disgraceful | |
| doubtable | |
| dubitable | |
| egregious(unusual, special, rare) | |
| excessively | |
| excluded | |
| farfetched | |
| fishy(adjective, extraordinary, amazing, unbelievable, implausible) | |
| flaky(extraordinary, amazing, incredible) | |
| flimsy(light, thin, extraordinary, strange, rare) | |
| for the birds(expression, idiom, extraordinary, amazing, incredible) | |
| full of holes(expression, idiom, extraordinary, amazing, incredible) | |
| ghost of a chance | |
| hard of belief(expression, idiom) |
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Unthinkable on
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| APA | Smart Define. (2015). unthinkable thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/unthinkable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "unthinkable thesaurus" https://smartdefine.org/unthinkable/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, unthinkable thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/unthinkable/thesaurus/synonyms>. |
| MLA | Smart Define. "unthinkable thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/unthinkable/thesaurus/synonyms> |