7 entries under reasonable topic. ×
| unlikely(adjective, adverb, unmistakably, possibly) | |
| implausible(adjective, likely, unlikely, plausible) | |
| inconceivable(adjective, imaginable) | |
| imcomprehensible | |
| incogitable | |
| insupposable | |
| unknowable |
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| APA | Smart Define. (2016). likely thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/likely/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "likely thesaurus" https://smartdefine.org/likely/thesaurus/antonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, likely thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/likely/thesaurus/antonyms>. |
| MLA | Smart Define. "likely thesaurus" 29 March 2016. Web. 23 September 2026. <https://smartdefine.org/likely/thesaurus/antonyms> |