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inefficacy

[in-ef-i-kuh-see] /ɪnˈɛf ɪ kə si/
noun
1.
lack of power or capacity to produce the desired effect.
Origin of inefficacy
1605-1615
1605-15; < Late Latin inefficācia. See in-3, efficacy
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Word Origin and History for inefficacy
n.

"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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