inefficacy

[in-ef-i-kuh-see]
noun
lack of power or capacity to produce the desired effect.

Origin:
1605–15; < Late Latin inefficācia. See in-3, efficacy

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World English Dictionary
inefficacious (ˌɪnɛfɪˈkeɪʃəs)
 
adj
failing to produce the desired effect
 
ineffi'caciously
 
adv
 
inefficacy
 
n
 
ineffi'caciousness
 
n
 
inefficacity
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

inefficacy
"want of force or virtue to produce the desired effect," 1612, from L.L. inefficacia, from inefficacem (nom. inefficax), from in- "not" + efficax (see efficacy).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It's sad to think that education regarding the inefficacy of rhino horn won't quench the alternative medicine market.
However unlike in other respects, they resemble it in its total inefficacy.
Nevertheless, this demonstrates the inefficacy of relying on market self-regulation to avoid excessive risk.
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