inefficacy
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About Our Definitions: All forms of a word (noun, verb, etc.) are now displayed on one page.in·ef·fi·ca·cy
noun \(ˌ)i-ˈne-fi-kə-sē\Definition of INEFFICACY
: lack of power to produce a desired effect
Origin of INEFFICACY
Late Latin inefficacia, from Latin inefficac-, inefficax inefficacious, from in- + efficac-, efficax efficacious
First Known Use: circa 1615
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