- Definitions|2
- Thesaurus|1.3k
- Abbreviations|0
52 entries under extraordinary topic. ×
| inconceivable(adjective, unusual, belief, unreasonable) | |
| unthinkable(noun, adjective, unusual, strange) | |
| unimaginable(adjective, unusual, strange, unreasonable) | |
| incredible(adjective, strange, unreasonable, unbelievable) | |
| improbable(adjective, wild, strange, unbelievable) | |
| unbelievable(adjective, hard, strange, unreasonable) | |
| unlikely(adjective, unusual, strange, unreasonable) | |
| implausible(adjective, hard, great, difficult) | |
| outlandish(adjective, hard, difficult, silly) | |
| doubtful(adjective, unreasonable, amazing, dubious) | |
| far-fetched(adjective, amazing, unlikely, implausible) | |
| questionable(adjective, amazing, unlikely, unbelievable) | |
| dubious(adjective, unreasonable, amazing, unlikely) | |
| fantastic(false, strange, silly, implausible) | |
| staggering(adjective, strange, amazing, unbelievable) | |
| suspect(unreasonable, amazing, dubious, unlikely) | |
| astonishing(amazing, incredible) | |
| beyond belief(expression, adjective, amazing, implausible) | |
| beyond reason(expression, strange, unbelievable, implausible) | |
| cockamamie(amazing, incredible) |
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| APA | Smart Define. (2016). impossible thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/impossible/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "impossible thesaurus" https://smartdefine.org/impossible/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, impossible thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/impossible/thesaurus/synonyms>. |
| MLA | Smart Define. "impossible thesaurus" 9 March 2016. Web. 22 September 2026. <https://smartdefine.org/impossible/thesaurus/synonyms> |