| useless(adjective, weak, sensible, inadequate, useful) | |
| feeble(adjective, strong, fit, ineffective) | |
| ineffective(adjective, strong, fit, useless, successful) | |
| weak(adjective, inadequate, adequate) | |
| dysfunctional(work, feature, state, adjective, function) | |
| fruitless(adjective, weak, inadequate, fruitful) | |
| time-consuming | |
| ineffectual(adjective, useless, competent) | |
| unorganized | |
| worthless | |
| abortive | |
| empty(adjective, ineffective, fruitless) | |
| feckless(adjective, purpose) | |
| impotent(adjective, strong, weak, inadequate, competent) | |
| incapable(adjective, strong, weak, fit, inadequate) | |
| incompetent(adjective, strong, weak, inadequate, qualified) | |
| inefficient(adjective, weak, sound, inadequate, competent) | |
| inoperative | |
| unproductive | |
| sinful |
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| APA | Smart Define. (2015). effective thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/effective/thesaurus/antonyms |
| Chicago | Smart Define. 2015. "effective thesaurus" https://smartdefine.org/effective/thesaurus/antonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, effective thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/effective/thesaurus/antonyms>. |
| MLA | Smart Define. "effective thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/effective/thesaurus/antonyms> |