as in efficient
producing or capable of producing a desired result
taking a cookie break while studying is one of the most efficacious ways of rejuvenating the mind that I have ever discovered
Synonyms & Similar Words
Relevance
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 efficacious
These efficacious, natural ingredients include chamomile, California poppy, lemon verbena, linden, magnesium, rosemary and cardamom.
—
Bianca Salonga, Forbes.com, 1 Apr. 2025
Thorne is also rigorously tested and has worked with independent researchers from places like Mayo Clinic and the National Institutes of Health, to ensure its products are high-performance, safe, and efficacious.
—Vogue, 30 Mar. 2025
Despite Chief Justice Warren formally writing the opinion to apply exclusively to education, its attack on segregation has—paradoxically—been most efficacious beyond that original context.
—Justin Driver, The Atlantic, 15 Mar. 2025
Oh, that’s right, there’s a measles vaccines that is over 97% efficacious against the measles after two doses are administered, which people have been getting for years.
—Bruce Y. Lee, Forbes, 15 Mar. 2025
See All Example Sentences for efficacious
Bianca Salonga, Forbes.com, 1 Apr. 2025
Thorne is also rigorously tested and has worked with independent researchers from places like Mayo Clinic and the National Institutes of Health, to ensure its products are high-performance, safe, and efficacious.
—Vogue, 30 Mar. 2025
Despite Chief Justice Warren formally writing the opinion to apply exclusively to education, its attack on segregation has—paradoxically—been most efficacious beyond that original context.
—Justin Driver, The Atlantic, 15 Mar. 2025
Oh, that’s right, there’s a measles vaccines that is over 97% efficacious against the measles after two doses are administered, which people have been getting for years.
—Bruce Y. Lee, Forbes, 15 Mar. 2025
See All Example Sentences for efficacious
Recent Examples of Synonyms for efficacious
Adjective
-
Life hacks are methods for making daily tasks easier, more efficient, or more enjoyable.—
Paul McClure
May 24,
New Atlas,
24 May 2025
-
It's powered by the fast and efficient S10 chip and boasts tons of health, fitness, and lifestyle features, including GPS workout recording, ECG, sleep and cycle tracking, music, podcast, and third-party app support.—
Cierra Cowan,
PC Magazine,
24 May 2025
Adjective
-
The Bank’s second incarnation, run by Nicholas Biddle, scion of a prominent Philadelphia family and Princeton valedictorian, was even more sophisticated and effective than the first.—
Time,
Time,
23 May 2025
-
The university was accused of failing to establish effective mechanisms for combatting antisemitism until last summer.—
Dalia Faheid,
CNN Money,
23 May 2025
Adjective
-
Major battlefield victories or changes in Russian politics are the most potent weapons, while sanctions can erode morale and resources.—
Ken Silverstein,
Forbes.com,
21 May 2025
-
While some have critiqued the plan due to size and scope and unbalanced comparison between the U.S. and Israel, it's anticipated that the Golden Dome will provide a more potent defense against adversaries like Russia, China, Iran and North Korea.—
Nick Mordowanec,
MSNBC Newsweek,
20 May 2025
Cite this Entry
“Efficacious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/efficacious. Accessed 4 Jun. 2025.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share