follow Dictionary.com

Love words? Sign up for our Word of the Day!

inefficacy

[in-ef-i-kuh-see] /ɪnˈɛf ɪ kə si/
noun
1.
lack of power or capacity to produce the desired effect.
Origin
1605-1615
1605-15; < Late Latin inefficācia. See in-3, efficacy
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
Word Origin and History for in efficacy

inefficacy

n.

"want of force or virtue to produce the desired effect," 1610s, from Late Latin inefficacia, from inefficacem (nominative inefficax), from in- "not, opposite of" (see in- (1)) + efficax (see efficacy).

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source

Word of the Day

Difficulty index for inefficacy

Few English speakers likely know this word

Word Value for in

2
3
Scrabble Words With Friends