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
As electronic warfare capabilities continue to proliferate, maintaining navigation and mission effectiveness without constant access to satellite signals has become increasingly important.
—
Kaif Shaikh, Interesting Engineering, 22 June 2026
There may be an issue with how the pills dissolve, which could impact their effectiveness.
—Jenna Anderson, Health, 22 June 2026
Still, questions linger about the effectiveness of such settlement agreements.
—Adriana Pérez, Chicago Tribune, 22 June 2026
Companies are championing this approach, highlighting its cost-effectiveness compared to new batteries.
—Ken Silverstein, Forbes.com, 21 June 2026
Heart risks In 2015, the US Food and Drug Administration required label changes on testosterone therapy that stated the safety and effectiveness had not been established for men who had signs and symptoms associated with idiopathic hypogonadism, a condition that involves low testosterone levels.
—Jacqueline Howard, CNN Money, 20 June 2026
Kaif Shaikh, Interesting Engineering, 22 June 2026
There may be an issue with how the pills dissolve, which could impact their effectiveness.
—Jenna Anderson, Health, 22 June 2026
Still, questions linger about the effectiveness of such settlement agreements.
—Adriana Pérez, Chicago Tribune, 22 June 2026
Companies are championing this approach, highlighting its cost-effectiveness compared to new batteries.
—Ken Silverstein, Forbes.com, 21 June 2026
Heart risks In 2015, the US Food and Drug Administration required label changes on testosterone therapy that stated the safety and effectiveness had not been established for men who had signs and symptoms associated with idiopathic hypogonadism, a condition that involves low testosterone levels.
—Jacqueline Howard, CNN Money, 20 June 2026
Recent Examples of Synonyms for effectiveness
Noun
-
But his dictionary, with its conclusiveness, was a huge publishing success.—
Louis Menand,
New Yorker,
22 Dec. 2025
Noun
-
From there the compound would need to clear safety and efficacy testing in clinical trials before it could ever be used with patients.—
Ryan Brennan,
Sacbee.com,
18 June 2026
-
Operating ‘beyond the bounds of FDA approval’ Although there is a lack of FDA approval and little evidence of its efficacy, stem cell treatments for autism are being steadily provided across the country.—
Theara Coleman,
TheWeek,
18 June 2026
Noun
-
The 6-6 playmaker displayed his versatility on both ends, knocking down shots, creating for teammates and making an impact defensively against top competition from around the world.—
Gary Bedore,
Kansas City Star,
18 June 2026
-
Community members also mourned Robert Dee’s loss, commemorating his impact.—
Reeti Malhotra,
Sacbee.com,
18 June 2026
Noun
-
This has now been questioned, with the attorney assigned to handle the foreclosure questioning the validity of the judgment.—
Adam England,
PEOPLE,
17 June 2026
-
If the identifier appears, access is denied regardless of the token’s cryptographic validity.—
Ethan M. Stone,
USA Today,
9 June 2026
Noun
-
The United States of America and the Islamic Republic of Iran acknowledge the critical importance of the nuclear issues above mentioned and express their intention to immediately address these issues in the negotiation in order to achieve mutual agreement on them.—
Shelby Talcott,
semafor.com,
17 June 2026
-
The Islamic Republic of Iran and the United States of America acknowledge the critical importance of the sanctions termination issue above mentioned and expressed their intentions to immediately address these issues in the negotiations in order to achieve mutual agreement on them.—
Mabinty Quarshie,
The Washington Examiner,
17 June 2026
Noun
-
These moves seek to address the brain drain of top technical talent following the invasion of Ukraine by playing to a traditional Russian strength—upskilling members of a population of some 140 million people, which has historically seen success in the mathematical sciences.—
Nikita Ostrovsky,
Time,
18 June 2026
-
Nearly 30 years later, and some 52 years after the country’s first World Cup appearance in West Germany, Haiti’s players must summon that same strength.—
Jacqueline Charles,
Miami Herald,
18 June 2026
Noun
-
In Juneteenth traditions, the color red holds historical significance.—
La'Tasha Givens,
CBS News,
20 June 2026
-
Haiti vs Brazil, more than a soccer game Despite the final result, the significance of the match extended beyond soccer.—
Jacqueline Charles,
Miami Herald,
20 June 2026
Noun
-
Six people – including two children – were killed and another child was hospitalized after a fiery head‑on collision Saturday between Bynum and Malone in Hill County, authorities said.—
Doug Myers,
CBS News,
21 June 2026
-
Lexington Police Department Moore’s body was found Wednesday afternoon near a gym that she was seen leaving on June 11 in Lexington, a city of roughly 23,000 west of Columbia, authorities said.—
Tim Stelloh,
NBC news,
20 June 2026
Cite this Entry
“Effectiveness.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/effectiveness. Accessed 23 Jun. 2026.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
