- lack of power or capacity to produce the desired effect.
Origin of inefficacy
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for inefficacy
In the man's emphasis the girl realized at last the inefficacy of her efforts to combat his will.Within the Law
It taught the efficacy of cruising—the inefficacy of fleets.Thirty Years' View (Vol. II of 2)
Thomas Hart Benton
All experience of their inefficacy does not in the least discourage them.
But on that night he felt the inefficacy of conventional antidotes to melancholy.The Trimmed Lamp
In the course of my argument I shall show the inefficacy of the confederation.
Word Origin and History for inefficacy
Online Etymology Dictionary, © 2010 Douglas Harper