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
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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
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These coverage losses were avoidable with better, more efficient communication.—
Lisa Fitzpatrick,
Forbes.com,
5 June 2025
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The company discontinued the 5.7-liter engine amid tightening fuel economy regulations and a companywide push toward electric vehicles and more efficient engines last year under ex-Stellantis CEO Carlos Tavares.—
Michael Wayland,
CNBC,
5 June 2025
Adjective
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Smaller doses, such as 3 mg/kg, can still be effective with fewer side-effects.4 The body produces beta-alanine, an amino acid, which works with other chemicals in the body to make carnosine.—
Heather Jones,
Verywell Health,
4 June 2025
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Instead, the revolutionaries relied on more subtle but equally effective means: publicly humiliating prominent loyalists and destroying their stature in the local community.—
Greg Daugherty,
Smithsonian Magazine,
4 June 2025
Adjective
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This week, Drake teams up with Canadian rap newcomer Smiley, Kim Gordon has a potent pro-freedom message for Donald Trump, and Colombian hitmaker Feid surprise releases his seventh studio album.—
Rolling Stone,
Rolling Stone,
13 June 2025
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The oil-free version of its Vogue Verified counterpart, this one provides powerful antioxidant protection while limiting oil production and reducing breakouts through a potent blend of l-ascorbic acid, silymarin, ferulic acid, and salicylic acid.—
Jenny Berg,
Vogue,
13 June 2025
Cite this Entry
“Efficacious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/efficacious. Accessed 17 Jun. 2025.
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