Synonym Chooser

How does the adjective efficacious contrast with its synonyms?

Some common synonyms of efficacious are effective, effectual, and efficient. While all these words mean "producing or capable of producing a result," efficacious suggests possession of a special quality or virtue that gives effective power.

a detergent that is efficacious in removing grease

When is effective a more appropriate choice than efficacious?

In some situations, the words effective and efficacious are roughly equivalent. However, effective stresses the actual production of or the power to produce an effect.

an effective rebuttal

When would effectual be a good substitute for efficacious?

Although the words effectual and efficacious have much in common, effectual suggests the accomplishment of a desired result especially as viewed after the fact.

the measures to stop the pilfering proved effectual

When can efficient be used instead of efficacious?

While the synonyms efficient and efficacious are close in meaning, efficient suggests an acting or a potential for action or use in such a way as to avoid loss or waste of energy in effecting, producing, or functioning.

an efficient small car

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 My company makes money when a third party provider recommends efficacious treatments of root cause non-pharmaceutical interventions. Miles Bryan, Vox, 30 Jan. 2025 Not all experts agree on whether eye creams are any more efficacious than, say, regular creams. Jenny Berg, Vogue, 5 Jan. 2025 Studies have shown navel administration of medication is efficacious and that navel oiling can help with digestion, as well as potentially relieve gynecological discomfort. Margaux Anbouba, Vogue, 18 Dec. 2024 Research suggests that the use of antiretroviral drugs and advances in managing HIV infections have helped make solid organ transplants in people with HIV safer and more efficacious. Jacqueline Howard, CNN, 27 Nov. 2024 See All Example Sentences for efficacious
Recent Examples of Synonyms for efficacious
Adjective
  • The enduring glow of London's historic gas lights London's gas lamps, which have cast their glow on the city for more than 200 years, have been nearly extinguished by the prevalence of cleaner, more efficient and brighter light sources, like LEDs.
    David Morgan, CBS News, 13 Mar. 2025
  • Europeans introduced the method of boiling sap in a metal pot over an open fire, which was more efficient, but the adoption of metalware resulted in a tragic side effect: the loss of traditional pottery skills and practices.
    Debbie Olsen, AFAR Media, 13 Mar. 2025
Adjective
  • Then Sterling did some less effective things and got suspended anyway, so that mad idea was, at least, parked for the time being.
    Amy Lawrence, The Athletic, 13 Mar. 2025
  • This is especially effective during mergers and acquisitions.
    Expert Panel®, Forbes, 12 Mar. 2025
Adjective
  • Watson joined the Chiefs in 2022, and his speed helped the team field one of the most potent offenses in the league.
    Nate Taylor, The Athletic, 11 Mar. 2025
  • Kentucky also boasts a potent offense led by several dangerous shooters, even after leading scorer Jaxson Robinson's unfortunate season-ending injury.
    William Lambers, Newsweek, 10 Mar. 2025

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Cite this Entry

“Efficacious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/efficacious. Accessed 24 Mar. 2025.

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