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61 antonyms for efficaciousness
ineffectiveness
ineffectuality
ineffectualness
inefficiency
failure
impotence
inability
incapacity
incompetence
uselessness
weakness
inadequacy
incapability
powerlessness
futility
vanity
hopelessness
fruitlessness
inefficacy
helplessness
unproductiveness
infirmity
unsuccessfulness
carelessness
disorganisation