effectualness

noun

Definition of effectualnessnext
as in efficacy
the power to produce a desired result the effectualness of that new cancer treatment has yet to be proven

Synonyms & Similar Words

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Antonyms & Near Antonyms

Example Sentences

Recent Examples of Synonyms for effectualness
  1. efficacy
  2. effectiveness
Noun
  • Immunity from flu vaccination is generally thought to last for around four to six months before losing some efficacy, according to the CDC.
    — Stephen Underwood, Hartford Courant, 2 Oct. 2026
  • Those figures are based on efficacy analysis that assumes patients remained on treatment in the trial.
    — Annika Kim Constantino, CNBC, 2 Oct. 2026
Definition of efficacy
Noun
  • The Policy Analysis Market (PAM) designed by Polk’s research firm, Net Exchange, for DARPA’s Information Awareness Office was one of many answers to questions raised about the effectiveness of US intelligence following 9/11.
    — Simon Denny, Artforum, 1 Oct. 2026
  • Beauty’s average audience size declined 30% year over year, while content performance slipped 1%, suggesting that effectiveness increasingly depends on creator quality rather than quantity.
    — Fernanda Tronco, Fortune, 1 Oct. 2026
Definition of effectiveness
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.

Browse Nearby Words

effectually
effectualness
effectuate
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Cite this Entry

“Effectualness.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/effectualness. Accessed 5 Oct. 2026.

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