54 entries under adjective topic. ×
| impossible | |
| implausible(reasonable, plausible) | |
| unlikely(reasonable, unreasonable, likely) | |
| improbable(unreasonable, likely, unlikely) | |
| inconceivable(reasonable, unreasonable, unlikely, imaginable) | |
| incredible(bad, unremarkable) | |
| impracticable | |
| unattainable | |
| dubious | |
| unbelievable | |
| impractical | |
| hopeless | |
| definite | |
| remote(close, open, unlikely, improbable) | |
| unfathomed(deep, wide) | |
| unimaginable | |
| vain(useless, futile) | |
| actual | |
| doubtful | |
| out(possible, gone) |
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| APA | Smart Define. (2015). possible thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/possible/thesaurus/antonyms |
| Chicago | Smart Define. 2015. "possible thesaurus" https://smartdefine.org/possible/thesaurus/antonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, possible thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/possible/thesaurus/antonyms>. |
| MLA | Smart Define. "possible thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/possible/thesaurus/antonyms> |