• Noun, plural -cies.

    capacity for producing a desired result or effect; effectiveness
    a remedy of great efficacy.

    Antonyms

    noun
    failure , inefficacy , inefficiency , unproductiveness , uselessness , weakness , impotency

    Synonyms

    noun
    ability , adequacy , capability , capableness , capacity , competence , effect , effectiveness , efficaciousness , energy , force , influence , performance , potency , power , strength , success , sufficiency , use , vigor , virtue , weightnotes:if something is efficacious , it is able to produce the desired result; efficacy means the power to produce effects , effectuality , effectualness , efficiency , advantage , productiveness
    Lấy từ « http://tratu.soha.vn/dict/en_en/Efficacy »

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