| unskilled(adjective, slow, inadequate) | |
| impotent(adjective, dull, strong, competent, unable) | |
| ailing | |
| amateur | |
| helpless(adjective, incompetent, vulnerable, incapable) | |
| inadequate(adjective, slow, incompetent, insufficient, defective) | |
| inefficient(adjective, sound, well, competent, wasteful) | |
| inexpert | |
| lame(adjective, weak, healthy, feeble, graceful) | |
| poor(adjective, strong, noble, adequate) | |
| unfit(adjective, ready) | |
| aberrant | |
| abortive | |
| abusive | |
| aggravate | |
| amiss | |
| anemic | |
| angular | |
| apocryphal | |
| awkward |
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| APA | Smart Define. (2016). able thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/able/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "able thesaurus" https://smartdefine.org/able/thesaurus/antonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2016, able thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/able/thesaurus/antonyms>. |
| MLA | Smart Define. "able thesaurus" 14 March 2016. Web. 21 September 2026. <https://smartdefine.org/able/thesaurus/antonyms> |