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Synonyms

inefficacy

American  
[in-ef-i-kuh-see] / ɪnˈɛf ɪ kə si /

noun

  1. lack of power or capacity to produce the desired effect.


Etymology

Origin of inefficacy

From the Late Latin word inefficācia, dating back to 1605–15. See in- 3, efficacy

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.

The process is often triggered by post-approval studies showing inefficacy, according to Harvard Law professor I. Glenn Cohen.

From Reuters • Mar. 23, 2023

He seemed to think he could figure this out, make the kind of adjustment he has made so many times before in a career defined by his ability to stave off long stretches of inefficacy.

From Washington Post • Oct. 7, 2022

He justified the approach by pointing to the inefficacy of other methods and asserting that there was “an intimate connection between the story of the patient’s sufferings and the symptoms of his illness.”

From The New Yorker • May 20, 2019

Mercifully, banner ads are in decline, due less to their ugliness than their inefficacy: Readers quickly learned to ignore them.

From Slate • Jun. 16, 2015

The only answer they generally received was, that it was the custom of the country; and the only result of their efforts was the distressing conviction of the inefficacy of their humane endeavors.

From Oriental Women by Pollard, Edward Bagby

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