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
Noun
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But the efficacy of that killswitch is unclear.
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From there the compound would need to clear safety and efficacy testing in clinical trials before it could ever be used with patients.
Noun
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Mathematically, if quality is seven and acceptance is four, effectiveness is 28.
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For Tokyo, that complicates the effectiveness of any unilateral intervention.
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“Effectualness.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/effectualness. Accessed 5 Jul. 2026.
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