Synonyms|27Antonyms|30|Broader|4Narrower|0Related|65
3
inefficacy
2
inability
2
inadequacy
2
inefficaciousness
1
incapacity
1
incompetence
1
incompetency
1
ineffectiveness
1
ineffectuality
1
ineffectualness
1
inefficiency
0
aridity
0
failure(noun, weakness)
0
fruitlessness
0
futility
0
hopelessness
0
impotence
0
inaction
0
inadequateness
0
incapability
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APASmart Define. (2015). efficaciousness thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/efficaciousness/thesaurus/antonyms
ChicagoSmart Define. 2015. "efficaciousness thesaurus" https://smartdefine.org/efficaciousness/thesaurus/antonyms (accessed September 21, 2026).
HarvardSmart Define 2015, efficaciousness thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/efficaciousness/thesaurus/antonyms>.
MLASmart Define. "efficaciousness thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/efficaciousness/thesaurus/antonyms>