28 entries under noun topic. ×
| inability(weakness, inefficiency) | |
| inefficiency | |
| incompetence(weakness, inefficiency) | |
| impotence(weakness, inefficiency) | |
| inadequacy(weakness, inefficiency) | |
| incapacity(weakness, inefficiency) | |
| ineffectiveness(weakness, inefficiency) | |
| weakness | |
| helplessness(weakness, inefficiency) | |
| incapability(weakness, inefficiency) | |
| incompetency | |
| disability(weakness, inefficiency) | |
| feebleness | |
| ineptitude | |
| ineptness(weakness, inefficiency) | |
| awkwardness | |
| failure | |
| fruitlessness | |
| futility | |
| idleness(weakness, inefficiency) |
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| APA | Smart Define. (2016). efficiency thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/efficiency/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "efficiency thesaurus" https://smartdefine.org/efficiency/thesaurus/antonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, efficiency thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/efficiency/thesaurus/antonyms>. |
| MLA | Smart Define. "efficiency thesaurus" 25 February 2016. Web. 23 September 2026. <https://smartdefine.org/efficiency/thesaurus/antonyms> |