as in efficacy
the power to produce a desired result
the effectualness of that new cancer treatment has yet to be proven
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Recent Examples of Synonyms for effectualness
efficacy
Noun
-
In addition to their individual benefits, these ingredients work together to boost the efficacy of other products in your routine and leave skin soft, supple, and radiant.—
Deanna Pai,
Vogue,
24 Aug. 2025 -
The group reviews the safety and efficacy of vaccines and helps to establish vaccine schedules to control the spread of infectious diseases.—
Kristen Jordan Shamus,
Freep.com,
23 Aug. 2025
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“Effectualness.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/effectualness. Accessed 3 Sep. 2025.
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