- Definitions|2
- Thesaurus|449
- Abbreviations|0
| nonfulfillment | |
| nonsuccess | |
| obstacle(noun, defeat, blow, failure, mistake) | |
| old one-two(noun, expression, defeat, blow, failure) | |
| penetration | |
| pettiness | |
| remiss | |
| shortfall(insufficiency, scantiness, meagerness) | |
| skill(noun, weakness, failure, shortcoming, powerlessness) | |
| sleeveless | |
| sleeveless errand(expression, idiom, inutility) | |
| slip(noun, defeat, blow, failure, mistake) | |
| subjection(noun, weakness, hopelessness, helplessness) | |
| successlessness | |
| unfruitfulness | |
| unimportance | |
| unserviceableness | |
| unsubservience | |
| unsuccessfulness | |
| unusableness |
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Inefficacy on
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| APA | Smart Define. (2015). inefficacy thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/inefficacy/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "inefficacy thesaurus" https://smartdefine.org/inefficacy/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, inefficacy thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/inefficacy/thesaurus/synonyms>. |
| MLA | Smart Define. "inefficacy thesaurus" 14 April 2015. Web. 26 September 2026. <https://smartdefine.org/inefficacy/thesaurus/synonyms> |