noun Etymology: Late Latin inefficacia, from Latin inefficac-, inefficax inefficacious, from in- + efficac-, efficax efficacious Date: circa 1615 lack of power to produce a desired effect

New Collegiate Dictionary. 2001.


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  • Inefficacy — In*ef fi*ca*cy, n. [L. inefficacia. See {In } not, and {Efficacy}.] Lack of power to produce the desired or proper effect; inefficiency; ineffectualness; futility; uselessness; fruitlessness; as, the inefficacy of medicines or means. [1913… …   The Collaborative International Dictionary of English

  • inefficacy — I noun disability, disablement, failure, feebleness, forcelessness, helplessness, impotence, inability, inadequacy, incapability, incapacitation, incapacity, incompetence, incompetency, ineffectiveness, ineffectuality, ineffectualness,… …   Law dictionary

  • inefficacy — (n.) want of force or virtue to produce the desired effect, 1610s, from L.L. inefficacia, from inefficacem (nom. inefficax), from in not, opposite of (see IN (Cf. in ) (1)) + efficax (see EFFICACY (Cf. efficacy)) …   Etymology dictionary

  • inefficacy — [in ef′i kə sē] n. [LL inefficacia] lack of efficacy; inability to produce the desired effect …   English World dictionary

  • inefficacy — /in ef i keuh see/, n. lack of power or capacity to produce the desired effect. [1605 15; < LL inefficacia. See IN 3, EFFICACY] * * * …   Universalium

  • inefficacy — noun The condition of being ineffective …   Wiktionary

  • inefficacy — (Roget s Thesaurus II) noun The condition or state of being incapable of accomplishing or effecting anything: helplessness, impotence, inadequacy, incapability, ineffectiveness, ineffectuality, ineffectualness, powerlessness, uselessness. See… …   English dictionary for students

  • inefficacy — in·ef·fi·ca·cy || ɪn efɪkÉ™sɪ n. inability to produce the desired results …   English contemporary dictionary

  • inefficacy — n. Ineffectualness …   New dictionary of synonyms

  • inefficacy — n 1. ineffectuality, ineffectualness, inefficaciousness; incapacity, inability, inadequacy, inefficiency, incompetence, ineptitude; uselessness, inutility, worthlessness, valuelessness, meritlessness, nu gacity. 2. futility, bootlessness,… …   A Note on the Style of the synonym finder

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