Definition of inefficacy
: lack of power to produce a desired effect
From the M-W Editors
Recent Examples of inefficacy from the Web
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The giraffe, said Mivart, was a perfect example of natural selection’s inefficacy.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'inefficacy'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Origin and Etymology of inefficacy
Late Latin inefficacia, from Latin inefficac-, inefficax inefficacious, from in- + efficac-, efficax efficacious
First Known Use: circa 1615
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