- Definitions|2
- Thesaurus|2.6k
- Abbreviations|0
| impactful | |
| violent(calm, weak) | |
| powerful(adjective, strong, fit, effective, successful) | |
| strong(adjective, fit, successful) | |
| effective(adjective, strong, fit, successful, productive) | |
| effectual(adjective, strong, fit, successful) | |
| efficient(adjective, strong, weak, fit, delicate) | |
| potent(adjective, strong, weak, soft, fit) | |
| successful(adjective, strong, fit) | |
| competent(adjective, strong, fit, successful) | |
| efficacious | |
| famous(bad, weak, unknown) | |
| forceful(adjective, weak, mild, powerful, effective) | |
| fruitful(adjective, strong, fit, successful) | |
| important | |
| impressive(adjective, powerful, influential) | |
| productive(adjective, strong, fit, successful) | |
| able(adjective, strong, fit, slow, inadequate) | |
| awesome | |
| cogent(adjective, effective) |
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| APA | Smart Define. (2016). ineffective thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/ineffective/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "ineffective thesaurus" https://smartdefine.org/ineffective/thesaurus/antonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, ineffective thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/ineffective/thesaurus/antonyms>. |
| MLA | Smart Define. "ineffective thesaurus" 29 March 2016. Web. 23 September 2026. <https://smartdefine.org/ineffective/thesaurus/antonyms> |