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 Defeat effectiveness exceeded approximately 75 to 80 percent, while operator observations indicated the system was even more effective at preventing hostile UAS from successfully completing their missions. — Prabhat Ranjan Mishra, Interesting Engineering, 30 Oct. 2026 Wauconda got good pressure on Gialo from its front four in the first meeting and a repeat would help limit his effectiveness. — Steve Reaven, Chicago Tribune, 29 Oct. 2026 Impressed by the quality and cost-effectiveness of the show, Fox quickly began discussing collaborating on other productions with BiggerStage. — Stacy Perman, Los Angeles Times, 29 Oct. 2026 Forman cautioned that the British recommendations remain largely optional and that their effectiveness will depend on whether institutions act. — Ariella Noveck, FOXNews.com, 28 Oct. 2026 At a meeting in July, FDA staffers reiterated that more than half a dozen peptides brought forward for reconsideration remained unproven in terms of safety and effectiveness. — ABC News, 28 Oct. 2026 Tyjae Spears isn’t in the rankings, but if Spears is active for the Titans, Tony Pollard would only slide back a few spots given Spears’ struggles with effectiveness and health. — Jake Ciely, New York Times, 28 Oct. 2026 Wellness influencers and some clinicians have promoted unproven peptides for a wide range of uses, though the evidence for their safety and effectiveness is sparse. — Sydney Lupkin, NPR, 28 Oct. 2026 The candidates disagreed on the effectiveness of the death penalty and on the issue of voter fraud. — Judy L. Thomas, Kansas City Star, 28 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
  • Marlow’s testimony also challenged the efficacy of Flock cameras and argued that the only situations that they have been studied and found to deter crime is in relation to car thefts and property crimes.
    — Graham Hurley, CNN Money, 1 Nov. 2026
  • The committee noted conflicting evidence on the drug’s efficacy and clear safety risks, including brain bleeds, in large numbers of patients.
    — C. Joseph Ross Daval, STAT, 30 Oct. 2026
Definition of efficacy
Noun
  • The sanctions, however, are unlikely to have a major impact on Rwanda, argued Dizolele, though Kigali will be cognizant of the impact on its image in the eyes of the West.
    — Adrian Elimian, semafor.com, 30 Oct. 2026
  • Cultivating future scientists While museums may be viewed simply as sites for school field trips or family outings, their impact extends far beyond entertainment.
    — Lili Mei Granda Argianas, The Conversation, 30 Oct. 2026
Definition of impact
Noun
  • The latter predicts a single universe by denying the universal validity of Schrödinger’s equation.
    — Philipp Strasberg, Scientific American, 20 Oct. 2026
  • According to the court, while NetChoice could challenge the validity of the Georgia law, the group had not sufficiently argued that enforcement of the law would be unconstitutional.
    — Dan Raby, CBS News, 15 Oct. 2026
Definition of validity
Noun
  • That refusal does not bode well for their ability to impartially decide matters involving this administration, and underscores the importance of the Senate’s confirmation power.
    — James Speyer, New York Daily News, 30 Oct. 2026
  • Innovation is nurtured from top to bottom by giving it the same importance as day-to-day operations.
    — Expert Panel®, Forbes.com, 30 Oct. 2026
Definition of importance
Noun
  • For Hernandez, the altar is a chance to grieve, remember and find strength in one another.
    — CBS News, CBS News, 28 Oct. 2026
  • But Splitter doesn’t want any of that development to take away from Miller’s preexisting strengths.
    — Julia Poe, Chicago Tribune, 28 Oct. 2026
Definition of strength
Noun
  • Its more recent holiday campaigns have similarly emphasized the emotional significance of gifting alongside its signature jewelry collections.
    — Thomas Waller, Footwear News, 28 Oct. 2026
  • The significance of the issue was clearly apparent by the fact that more than a dozen lawmakers attended the hearing during what is the Legislature’s recess.
    — Stephen Hobbs, Sacbee.com, 28 Oct. 2026
Definition of significance
Noun
  • The roughly 3-inch pocket knife was confiscated by authorities, Manfre said.
    — Iris Kwok, Los Angeles Times, 29 Oct. 2026
  • Lurie pointed out that the FDA, under federal law, does not have the authority to enforce those pharmacy requirements.
    — Arkansas Online, Arkansas Online, 29 Oct. 2026
Definition of authority

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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 4 Nov. 2026.

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