First Known Use: circa 1615
Dictionary
inefficacy
noun in·ef·fi·ca·cy \(ˌ)i-ˈne-fi-kə-sē\
Definition of INEFFICACY
: lack of power to produce a desired effect
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Origin of INEFFICACY
Late Latin inefficacia, from Latin inefficac-, inefficax inefficacious, from in- + efficac-, efficax efficacious
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