The state or quality of being incapable of producing a desired effect or result.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "inefficacy" in a sentence
"Of force, the inefficacy has been already tried; since the Latins have subdued the empire, without subduing the minds, of the Greeks."
"Consider Hamilton's observation regarding the "inefficacy" of Government."
"Now, Reid has brought the kind of inefficacy that led to the demise of health care to the forefront on jobs."