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inefficacious

[in-ef-i-key-shuh s] /ˌɪn ɛf ɪˈkeɪ ʃəs/
adjective
1.
not able to produce the desired effect; ineffective.
Origin
1650-1660
1650-60; in-3 + efficacious
Related forms
inefficaciously, adverb
inefficaciousness, inefficacity
[in-ef-i-kas-i-tee] /ˌɪn ɛf ɪˈkæs ɪ ti/ (Show IPA),
noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples for inefficacious
  • Prognosis in the majority of patients has been dismal as conventional systemic therapies have been largely inefficacious.
British Dictionary definitions for inefficacious

inefficacious

/ˌɪnɛfɪˈkeɪʃəs/
adjective
1.
failing to produce the desired effect
Derived Forms
inefficaciously, adverb
inefficacy (ɪnˈɛfɪkəsɪ), inefficaciousness, inefficacity (ˌɪnɛfɪˈkæsɪtɪ) noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word of The Day

Difficulty index for inefficacious

Few English speakers likely know this word

Word Value for inefficacious

23
0
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Quotes with inefficacious