Synonyms|428Antonyms|78|Broader|9Narrower|13Related|102
0
disability
0
dissuade
0
dulness
0
emptiness
0
enervation(noun, inadequacy, ineffectiveness)
0
entice
0
espouse
0
everglade
0
fen
0
fenland
0
frivolity
0
frothiness
0
fruitlessness
0
futility
0
grounds
0
helplessness
0
hollowness
0
hopelessness
0
imbecility
0
impotency
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APASmart Define. (2015). efficacy thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/efficacy/thesaurus/antonyms
ChicagoSmart Define. 2015. "efficacy thesaurus" https://smartdefine.org/efficacy/thesaurus/antonyms (accessed September 23, 2026).
HarvardSmart Define 2015, efficacy thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/efficacy/thesaurus/antonyms>.
MLASmart Define. "efficacy thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/efficacy/thesaurus/antonyms>