effectiveness

noun

Definition of effectivenessnext
1
as in conclusiveness
the capacity to persuade the "guilty" verdict was all the proof needed of the effectiveness of the prosecutor's closing argument

Synonyms & Similar Words

Relevance

Antonyms & Near Antonyms
2
as in efficacy
the power to produce a desired result the huge upsurge in sales pretty much demonstrated the effectiveness of the new ad campaign

Synonyms & Similar Words

Antonyms & Near Antonyms
3
as in impact
the quality of an utterance that provokes interest and produces an effect your writing lacks effectiveness because practically every sentence is in the passive voice

Synonyms & Similar Words

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 effectiveness The agency has repeatedly reaffirmed the pill’s safety and effectiveness over the years, in addition to easing a number of restrictions on the drug, including dropping a requirement that it be dispensed in person. — CNN Money, 8 Oct. 2026 The agency has repeatedly reaffirmed the pill's safety and effectiveness over the years, in addition to easing a number of restrictions on the drug, including dropping a requirement that it be dispensed in person. — CBS News, 8 Oct. 2026 Drawing on nearly 250 responses from audit committee chairs and members, the report found that 70% identify technology, including AI, as the skill most needed to improve committee effectiveness. — Sheryl Estrada, Fortune, 8 Oct. 2026 His effectiveness at guard is best reflected by how smoothly the Bears’ offense runs despite no returning starters, a new system and numerous injuries. — Steve Reaven, Chicago Tribune, 8 Oct. 2026 Increasing the number of personnel in the defense forces does not necessarily increase their effectiveness, Chmut said. — Samya Kullab, Los Angeles Times, 8 Oct. 2026 In March 2025, the board voted 5-3 to increase CMS’ contract with SYDKIMYL, an education consulting company owned by Kimberly McGregor, from $325,000 to $500,000 after members questioned its effectiveness and McGregor’s family ties to the district. — Charlotte Observer, 7 Oct. 2026 Subsequent trials in the late 1960s and ’70s eventually proved its effectiveness, and the drug ultimately was recognized for exerting strong antipsychotic effects with virtually no adverse impacts on motor function. — Encyclopedia Britannica, 7 Oct. 2026 The data tracked in those studies is then used to evaluate progress and the effectiveness of safety improvements. — Kendrick Calfee, Kansas City Star, 7 Oct. 2026
Recent Examples of Synonyms for effectiveness
  1. conclusiveness
  2. efficacy
  3. impact
  4. validity
  5. importance
  6. strength
  7. significance
  8. authority
Noun
  • On Friday morning, Burke’s defense team tried to sow doubt about the conclusiveness of the autopsy conducted in the case.
    — Richard Winton, Los Angeles Times, 24 July 2026
  • But his dictionary, with its conclusiveness, was a huge publishing success.
    — Louis Menand, New Yorker, 22 Dec. 2025
Definition of conclusiveness
Noun
  • Bloomberg reports that insiders say Gemini 4 has solid model efficacy, but isn’t as stellar when employees actually use it, and that the model has issues with some coding tasks.
    — John Kell, Fortune, 7 Oct. 2026
  • Why the burning sensation is not a benefit That sharp alcohol sting many of us learned to equate with efficacy is doing no useful work.
    — Hanna Wickes, Sacbee.com, 5 Oct. 2026
Definition of efficacy
Noun
  • The production was shut down in Livingston, Montana last Saturday when locals complained about the production’s impact on the Livingston food bank and improper warnings about hazardous stunts.
    — Pat Saperstein, Variety, 10 Oct. 2026
  • Take Niklas Adalberth, who used his wealth from co-founding Klarna to set up the impact investor Norrsken, or Karl-Johan Persson, H&M chairman and grandson of its founder, who regularly backs Swedish startups.
    — Jan Larsson, Fortune, 9 Oct. 2026
Definition of impact
Noun
  • The canvassing board is made up of Garcia and two county judges, and is responsible for determining the validity of ballots and whether they should be counted.
    — Joshua Ceballos, Miami Herald, 2 Oct. 2026
  • There’s a distrust in the validity of big data, with everything seeming more vulnerable than ever to outside influence by unseen forces with specific agendas.
    — Andrew Unterberger, Billboard, 29 Sep. 2026
Definition of validity
Noun
  • The project highlights the growing importance of the defence industrial base in determining how quickly military modernization programmes can deliver results.
    — Prabhat Ranjan Mishra, Interesting Engineering, 9 Oct. 2026
  • Qatar has been building an international energy portfolio for more than a decade, and those assets are taking on more importance as the country’s exports have dwindled during the Iran war.
    — semafor.com, semafor.com, 9 Oct. 2026
Definition of importance
Noun
  • For me, a trophy is not defined by the price of an artwork, but by the strength of my connection to it.
    — Maximilíano Durón, ARTnews.com, 7 Oct. 2026
  • But the strength at the index level masks weakness beneath the surface.
    — Lee Ying Shan, CNBC, 7 Oct. 2026
Definition of strength
Noun
  • The scene’s relatively minor significance reflects a fourth season that comes into its own in a similarly minor key.
    — Ben Travers, IndieWire, 7 Oct. 2026
  • China recognized the strategic significance of these resources early and has spent decades building a near monopoly over the critical mineral industry in many parts of Africa.
    — Jared Cohen, Foreign Affairs, 7 Oct. 2026
Definition of significance
Noun
  • Meta was working to integrate Manus' team and technology into its system when authorities blocked the deal.
    — Anniek Bao, CNBC, 8 Oct. 2026
  • Bulgarian maritime authorities said Wednesday that the search efforts for the crew of Alfa Watan had been suspended and wouldn't resume.
    — Arkansas Online, Arkansas Online, 8 Oct. 2026
Definition of authority

Browse Nearby Words

effectively
effectiveness
effects
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Cite this Entry

“Effectiveness.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/effectiveness. Accessed 14 Oct. 2026.

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