in efficacity

inefficacious

[in-ef-i-key-shuhs]
adjective
not able to produce the desired effect; ineffective.

Origin:
1650–60; in-3 + efficacious

inefficaciously, adverb
inefficaciousness, inefficacity [in-ef-i-kas-i-tee] , noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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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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