effectualness

noun

Definition of effectualnessnext
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
  1. efficacy
  2. effectiveness
Noun
  • Huynh described the phase 3 results as clinically meaningful and likely to support regulatory approval, but said the primary efficacy result landed at the low end of investor expectations.
    — Annika Kim Constantino, CNBC, 23 Oct. 2026
  • While that efficacy doesn’t match the performance of a rival drug from Roche, Novartis’ treatment has a cleaner safety profile that could give it a shot at being competitive in the market.
    — Andrew Joseph, STAT, 23 Oct. 2026
Definition of efficacy
Noun
  • 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
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

“Effectualness.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/effectualness. Accessed 2 Nov. 2026.

Copy Citation
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Last Updated: - Updated example sentences

More from Merriam-Webster

Word of the Day

Listen to the pronunciation of satiate

See Definitions and Examples »

Popular in Grammar & Usage

See More

How to Use 'Who' vs. 'Whom'

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

'Affect' vs. 'Effect'

'A' or 'an'? What about before 'h'? An Indefinite Article Guide

Why is '-ed' sometimes pronounced at the end of a word?
See More

Popular in Wordplay

See More

The Longest Long Words List

9 Words That Sound Like Insults But Aren't

Pwn, Skibidi, Girlboss and Other Words Added to the 2026 SCRABBLE Dictionary

Ten More Words from Taylor Swift Songs

12 Lovely and Unusual Words for the Natural World
See More

Popular

See More

How to Use 'Who' vs. 'Whom'

The Longest Long Words List

9 Words That Sound Like Insults But Aren't
See More

Games & Quizzes

See All
Play Quordle: Guess all four words in a limited number of tries. Each of your guesses must be a real 5-letter word.
Quordle Can you solve 4 words at once?
Play Blossom: Solve today's spelling word game by finding as many words as you can using just 7 letters. Longer words score more points.
Blossom Pick the best words!
Play Missing Letter: a crossword with a twist. Each of the 25 puzzle words start with a different letter of the alphabet. Which letter is missing?
The Missing Letter A daily crossword with a twist
couple-laugh-cafe
Quiz: Foreign Phrases You Should Know Check out your bona fides and avoid any faux pas.
See All