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Synonyms

inefficacious

American  
[in-ef-i-key-shuhs] / ˌɪn ɛf ɪˈkeɪ ʃəs /

adjective

  1. not able to produce the desired effect; ineffective.


inefficacious British  
/ ˌɪnɛfɪˈkæsɪtɪ, ˌɪnɛfɪˈkeɪʃəs, ɪnˈɛfɪkəsɪ /

adjective

  1. failing to produce the desired effect

"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

Other Word Forms

  • inefficaciously adverb
  • inefficaciousness noun
  • inefficacity noun
  • inefficacy noun

Etymology

Origin of inefficacious

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

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Remedies for the starling plague were suggested, some facetious, some earnest, all equally inefficacious.

From Time Magazine Archive

Most nostrums hit at only one of the causes and so are frequently inefficacious.

From Time Magazine Archive

The puerilities of inefficacious charms and mysterious ceremonies with which he deludes his clients are not all.

From Jamaican Song and Story Annancy stories, digging sings, ring tunes, and dancing tunes by Jekyll, Walter

The omniscient God-man here asserts the existence of graces which remained inefficacious in Corozain and Bethsaida, though had they been given to the inhabitants of Tyre and Sidon, they would have proved effective.

From Grace, Actual and Habitual A Dogmatic Treatise by Preuss, Arthur

All this proving inefficacious, the Emperor Taitsu, as already stated, addressed to Ashikaga Yoshimitsu a remonstrance which moved the shogun to issue a strict injunction against the marauders.

From A History of the Japanese People From the Earliest Times to the End of the Meiji Era by Brinkley, F. (Frank)