- Definitions|2
- Thesaurus|834
- Abbreviations|0
38 entries under noun topic. ×
| fruitlessness | |
| futility | |
| idleness(weakness, ineffectiveness) | |
| inanity | |
| inconvenience | |
| ineptness | |
| inexpediency | |
| lethargy(weakness, ineffectiveness) | |
| maladroitness | |
| retardation | |
| senselessness | |
| slowness | |
| stiffness | |
| stupidity | |
| subnormality | |
| unfitness | |
| unproductivity(weakness, ineffectiveness) | |
| unwieldiness |
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| APA | Smart Define. (2016). effectiveness thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/effectiveness/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "effectiveness thesaurus" https://smartdefine.org/effectiveness/thesaurus/antonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2016, effectiveness thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/effectiveness/thesaurus/antonyms>. |
| MLA | Smart Define. "effectiveness thesaurus" 25 February 2016. Web. 27 September 2026. <https://smartdefine.org/effectiveness/thesaurus/antonyms> |