EFFECTUALNESS Synonyms: 22 Similar and Opposite Words

effectualness

noun

Definition of effectualness

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

Relevance

Antonyms & Near Antonyms

Example Sentences

Recent Examples of Synonyms for effectualness

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 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, 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, CBS News, 8 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

See all Nearby Words

Cite this Entry

Style

“Effectualness.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/effectualness. Accessed 12 Oct. 2026.

Copy Citation

Synonyms of effectualness

noun

Example Sentences

Browse Nearby Words

Cite this Entry

More from Merriam-Webster

Word of the Day

nexus

Popular in Grammar & Usage

Do You Need a New Language Peeve?

The Exceptions of '-s' and '-es' Plurals

Merriam-Webster’s Great Big List of Words You Love to Hate

Is it 'nerve-racking' or 'nerve-wracking'?

What's the difference between 'fascism' and 'socialism'?

Popular in Wordplay

The Real Origin of 'Supercalifragilistic'

9 Words That Sound Like Insults But Aren't

7 Words for Bad Endings and Rough Situations

The Words of the Week - Oct. 9

Why do we call it a 'flea market'?

Popular

Do You Need a New Language Peeve?

The Real Origin of 'Supercalifragilistic'

9 Words That Sound Like Insults But Aren't

Games & Quizzes