Synonyms|27Antonyms|30|Broader|4Narrower|0Related|65

21 entries under noun topic. ×

3
inefficacy
2
inability
2
inadequacy
1
incapacity
1
ineffectiveness
1
ineffectuality
1
ineffectualness
1
inefficiency
0
aridity
0
failure
0
fruitlessness
0
futility
0
hopelessness
0
inaction
0
insignificance
0
invalidity
0
meanness
0
pettiness
0
triviality
0
unimportance
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APASmart Define. (2015). efficaciousness thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/efficaciousness/thesaurus/antonyms
ChicagoSmart Define. 2015. "efficaciousness thesaurus" https://smartdefine.org/efficaciousness/thesaurus/antonyms (accessed September 25, 2026).
HarvardSmart Define 2015, efficaciousness thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/efficaciousness/thesaurus/antonyms>.
MLASmart Define. "efficaciousness thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/efficaciousness/thesaurus/antonyms>