| incongruous | |
| infelicitous | |
| irrelevant(adjective, improper, inappropriate) | |
| slow | |
| unbecoming | |
| unfit | |
| unfitting(adjective, improper, inappropriate) | |
| unsustainable | |
| wrong | |
| amiss | |
| averse | |
| awkward | |
| brainless | |
| bungling | |
| clumsy | |
| dopey | |
| graceless | |
| idiotic | |
| inapposite | |
| incompatible |
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| APA | Smart Define. (2016). apt thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/apt/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "apt thesaurus" https://smartdefine.org/apt/thesaurus/antonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, apt thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/apt/thesaurus/antonyms>. |
| MLA | Smart Define. "apt thesaurus" 29 March 2016. Web. 23 September 2026. <https://smartdefine.org/apt/thesaurus/antonyms> |