1
as in unsuccessful
not producing the desired result
his efforts to restore the neglected houseplant back to health were belated and sadly inefficacious
Synonyms & Similar Words
Relevance
Antonyms & Near Antonyms
2
as in futile
producing no results
an inefficacious medication for a rare form of tuberculosis
Synonyms & Similar Words
Antonyms & Near Antonyms
Example Sentences
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Recent Examples of inefficacious
Most wore inefficacious cloth masks, too.
—
James Lileks, National Review, 25 Aug. 2022
Day — who grew up watching the spelling bee — came up with the concept of exploring the psyche of a winner with an ultimately inefficacious career in 2015 while at a UCB improv sketch-writing class.
—NBC News, 6 Oct. 2020
James Lileks, National Review, 25 Aug. 2022
Day — who grew up watching the spelling bee — came up with the concept of exploring the psyche of a winner with an ultimately inefficacious career in 2015 while at a UCB improv sketch-writing class.
—NBC News, 6 Oct. 2020
Recent Examples of Synonyms for inefficacious
Adjective
-
June became hopeful that the American rescue mission would lead to a reunion with her daughter, but that was unsuccessful.—
Abigail Lee,
Variety,
8 Apr. 2025
-
Last year, Harry’s legal action against the Home Office was unsuccessful and the court initially refused him permission to appeal.—
Christian Edwards,
CNN Money,
8 Apr. 2025
Adjective
-
Impeachment of judges, however, is widely seen as a futile endeavor on Capitol Hill.—
Tara Suter,
The Hill,
3 Apr. 2025
-
The confrontation ends in an electric if futile horse chase.—
Amanda Whiting,
Vulture,
23 Mar. 2025
Adjective
-
The erosion of wealth due to inefficient tax structures underscores the importance of working with specialists who understand how to leverage available tools effectively.—
Ethan Stone,
USA Today,
2 Apr. 2025
-
But the small farms are inefficient and help explain a national poverty rate of more than 30%, the bank points out.—
Francine Kiefer,
Christian Science Monitor,
1 Apr. 2025
Adjective
-
For most of us, our inbox goals are the same: minimize useless spam, file away messages that don’t require your attention right away, and bring urgent items to the forefront.—
Aytekin Tank,
Forbes.com,
8 Apr. 2025
-
His devastating splitter would be useless without first establishing everything else in the strike zone.—
Fabian Ardaya,
New York Times,
6 Apr. 2025
Adjective
-
Sources suggest her departure may have been due to ineffective communication with her west coast bosses.—
Ethan Millman,
HollywoodReporter,
4 Apr. 2025
-
Although many in the education field support cellphone restrictions, some argue that blanket bans are too carceral and obscure deeper problems, including addictive social media platforms and ineffective teaching practices.—
Ryan Fonseca,
Los Angeles Times,
31 Mar. 2025
Adjective
-
Now, a new study may shed light on why consuming too much of the artificial sweetener sucralose could be counterproductive.—
Sandee LaMotte,
CNN Money,
29 Mar. 2025
-
Fighting this foreign free riding is critically important -- but not all methods are equally effective, and some reforms under consideration may even be counterproductive.—
Tomas J. Philipson,
National Review,
27 Mar. 2025
Cite this Entry
“Inefficacious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/inefficacious. Accessed 15 Apr. 2025.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share