efficacy Antonyms

inefficacy crookedness ineffectualness inefficaciousness inefficiency injustice insolubility insufficiency marsh weakness fruitlessness defectiveness fenland marshland pointlessness adverse effect analysis paralysis ineffectuality ineffectiveness incompetence deceit deception detrimentalness dishonesty everglade failure falsehood falseness feebleness fen hypocrisy impotence impotency inability inadequacy incapableness lack of ability