| in blue funk(expression, idiom, spirited) | |
| in the power of(expression, idiom, adverb, major, under) | |
| inactive | |
| inattentive | |
| incomplete | |
| indifferent | |
| inert | |
| infra | |
| instant | |
| knockdown | |
| lackadaisical | |
| languid | |
| languishing | |
| languorous | |
| lessen(verb, drop) | |
| lifeless | |
| limp | |
| listless | |
| loss | |
| low |
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| APA | Smart Define. (2016). up thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/up/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "up thesaurus" https://smartdefine.org/up/thesaurus/antonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2016, up thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/up/thesaurus/antonyms>. |
| MLA | Smart Define. "up thesaurus" 26 February 2016. Web. 21 September 2026. <https://smartdefine.org/up/thesaurus/antonyms> |