| in order(expression, weak, irregular) | |
| in use(expression, exceptional) | |
| incessant | |
| inclusive | |
| incompressible | |
| infamous | |
| inferior | |
| innumerable | |
| insignificant | |
| insufficiency | |
| intermediate | |
| interminable | |
| kitsch | |
| kitschy | |
| latest word(expression, exceptional, irregular) | |
| lesser | |
| level(rough, irregular, broken, indefinite) | |
| looked for(expression, unusual, unreasonable, irregular) | |
| low-grade | |
| lowbrow |
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| APA | Smart Define. (2016). rare thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/rare/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "rare thesaurus" https://smartdefine.org/rare/thesaurus/antonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2016, rare thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/rare/thesaurus/antonyms>. |
| MLA | Smart Define. "rare thesaurus" 14 March 2016. Web. 28 September 2026. <https://smartdefine.org/rare/thesaurus/antonyms> |