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inefficacious

[ in-ef-i-key-shuh s ]
/ ˌɪn ɛf ɪˈkeɪ ʃəs /
SEE SYNONYMS FOR inefficacious ON THESAURUS.COM

adjective

not able to produce the desired effect; ineffective.

Words related to inefficacious

abortive, barren, bootless, feckless, feeble, fruitless, futile, idle, impotent, inadequate, incompetent, indecisive, ineffective, inefficient, inept, inferior, innocuous, inoperative, lame, limited

Words nearby inefficacious

ineducation, ineffable, ineffaceable, ineffective, ineffectual, inefficacious, inefficacy, inefficiency, inefficient, inegalitarian, inelastic

Origin of inefficacious

First recorded in 1650–60; in-3 + efficacious

OTHER WORDS FROM inefficacious

in·ef·fi·ca·cious·ly, adverbin·ef·fi·ca·cious·ness, in·ef·fi·cac·i·ty [in-ef-i-kas-i-tee] /ˌɪn ɛf ɪˈkæs ɪ ti/, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for inefficacious

British Dictionary definitions for inefficacious

inefficacious
/ (ˌɪnɛfɪˈkeɪʃəs) /

adjective

failing to produce the desired effect

Derived forms of inefficacious

inefficaciously, adverbinefficacy (ɪnˈɛfɪkəsɪ), inefficaciousness or 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