55 entries under adjective topic. ×
| otiose | |
| unsuccessful | |
| dependent(strong, power, valid, legal) | |
| helpless | |
| idle(worthless, ineffective) | |
| inactive | |
| inconclusive | |
| inexpedient | |
| inexpert | |
| non-beneficial(effect, result, outcome) | |
| nugatory | |
| pointless | |
| powerless | |
| unqualified | |
| vapid | |
| dud | |
| faint | |
| flat | |
| flimsy | |
| fragile |
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| APA | Smart Define. (2015). effective thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/effective/thesaurus/antonyms |
| Chicago | Smart Define. 2015. "effective thesaurus" https://smartdefine.org/effective/thesaurus/antonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, effective thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/effective/thesaurus/antonyms>. |
| MLA | Smart Define. "effective thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/effective/thesaurus/antonyms> |