Synonyms of effectiveness

effectiveness

noun

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

• conclusiveness
• validity
• strength
• authority
• persuasiveness
• credibility
• soundness
• forcefulness
• cogency
• impact
• persuasion
• power
• convincingness
• suasiveness
• force
• influence
• appeal
• weight
• believability
• might
• definitiveness
• punch
• seductiveness
• authoritativeness
• sway

Antonyms & Near Antonyms

• ineffectiveness
• inconclusiveness
• invalidity
• ineffectuality
• unsoundness
• ineffectualness
• weakness
• shakiness
• powerlessness
• feebleness

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

• efficacy
• efficaciousness
• efficiency
• productiveness
• ability
• efficacity
• effectualness
• capability
• edge
• strength
• capacity
• potency
• puissance

Antonyms & Near Antonyms

• ineffectiveness
• inefficiency
• inability
• ineffectuality
• inadequacy
• ineffectualness
• incompetence
• incompetency
• inadequateness

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

• impact
• importance
• significance
• force
• point
• punch
• forcefulness
• appeal
• cogency
• attraction
• payoff
• charm
• fascination

Example Sentences

Recent Examples of effectiveness

How closely matched the flu vaccine is to the dominant strain of the season is part of what accounts for the year-to-year changes in the shot’s effectiveness. — Elise Haulund, CNN Money, 14 Aug. 2026

Because supplements don't have to undergo FDA approval for safety or effectiveness before being sold, Wood also recommends looking for products independently tested by a reputable third party. — Dr. Onaola Adedeji, ABC News, 13 Aug. 2026

External control arms, comparative effectiveness studies against real-world standard of care, post-market expansions of indication and broader safety analyses all become more tractable. — David Talby, Forbes.com, 12 Aug. 2026

Investigators documented problems with required chloramine-effectiveness sampling. — Kurt Knutsson, FOXNews.com, 12 Aug. 2026

Separate agents for updating knowledge base articles with data from customer service interactions and evaluating your bots’ effectiveness are supposedly coming soon. — Dianna Gunn, PC Magazine, 11 Aug. 2026

Although the findings are encouraging, Yale University clinical psychologist Brian Kiluk, who wasn’t involved in the study, says the sample size is too small to draw any firm conclusions about psilocybin’s effectiveness. — Humberto Basilio, Scientific American, 10 Aug. 2026

In terms of the effectiveness of the vaccines, there's no benefit in spacing them out. — Richard Escobedo, CBS News, 10 Aug. 2026

That data has been built over decades - through large clinical trials, real-world effectiveness studies and continuous safety monitoring involving millions of children. — Swapna Venugopal Ramaswamy, USA Today, 10 Aug. 2026