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

Origin of INEFFICACY

Late Latin inefficacia, from Latin inefficac-, inefficax inefficacious, from in- + efficac-, efficax efficacious
First Known Use: circa 1615

Browse

Next Word in the Dictionary: inefficiencyPrevious Word in the Dictionary: inefficacityAll Words Near: inefficacy
July 05, 2015
bunkum Hear it
insincere or foolish talk
Take a 3-minute break and test your skills!
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears