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[in-ef-i-kuh-see] /ɪnˈɛf ɪ kə si/
lack of power or capacity to produce the desired effect.
Origin of inefficacy
1605-15; < Late Latin inefficācia. See in-3, efficacy Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for inefficacy
  • It's sad to think that education regarding the inefficacy of rhino horn won't quench the alternative medicine market.
  • However unlike in other respects, they resemble it in its total inefficacy.
  • Nevertheless, this demonstrates the inefficacy of relying on market self-regulation to avoid excessive risk.
Word Origin and History for inefficacy

"want of force or virtue to produce the desired effect," 1610s, from Late Latin inefficacia, from inefficacem (nominative inefficax), from in- "not, opposite of" (see in- (1)) + efficax (see efficacy).

Online Etymology Dictionary, © 2010 Douglas Harper
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