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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To inefficacious
Collins
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Example sentences
Prognosis in the majority of patients has been dismal as conventional systemic therapies have been largely inefficacious.
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature