powerful
Americanadjective
-
having or exerting great power or force.
- Antonyms:
- weak
-
physically strong, as a person.
a large, powerful athlete.
-
producing great physical effects, as a machine or a blow.
-
potent; efficacious.
a powerful drug.
-
having great effectiveness, as a speech, speaker, description, reason, etc.
- Synonyms:
- effective, cogent, forcible, convincing, influential
-
having great power, authority, or influence; mighty.
a powerful nation.
-
Chiefly South Midland and Southern U.S. great in number or amount.
a powerful lot of money.
adjective
-
having great power, force, potency, or effect
-
extremely effective or efficient in action
a powerful drug
a powerful lens
-
dialect large or great
a powerful amount of trouble
adverb
Synonym Usage
Powerful, mighty, potent suggest great force or strength. Powerful suggests capability of exerting great force or overcoming strong resistance: a powerful machine like a bulldozer. Mighty, now chiefly rhetorical, implies uncommon or overwhelming strength of power: a mighty army. Potent implies great natural or inherent power: a potent influence.
Other Word Forms
Etymology
Origin of powerful
First recorded in 1350–1400, powerful is from the Middle English word powarfull. See power, -ful
Explanation
Something that's powerful displays, well, power. Your neighbor who just finished training to be a fireman probably looks much more powerful than he used to. We use powerful for many different senses of "strong." A powerful medicine is very effective. A powerful politician has more influence than most politicians. A powerful dog could probably knock you down. If you're reading a book written in folksy Southern vernacular, someone might use powerful to mean "very," as in, "that was a powerful good supper, Miss Jackson," or "you look powerful good tonight."
Vocabulary lists containing powerful
In the Mood? 100 Words to Describe Emotions
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Hooked on a Feeling, List 1
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The same accusation was leveled at Anthropic when it held back the public release of its powerful Mythos model over cybersecurity concerns.
From Barron's ● Jul. 29, 2026
And in my experience, it’s one of the most powerful planning tools a family can ever use.
From MarketWatch ● Jul. 29, 2026
Japan's south-western Kyushu region has had more than 100 aftershocks since it was struck on Tuesday by a powerful earthquake which left at least 13 people dead.
From BBC ● Jul. 29, 2026
The figurative enemy, Hofstadter wrote, “is a perfect model of malice, a kind of amoral superman — sinister, ubiquitous, powerful, cruel, sensual, luxury-loving.”
From Los Angeles Times ● Jul. 29, 2026
“A stiltskin is magic at its greatest. Pure magic, un-meddled-with and more powerful than any enchantment or spell.”
From "Rump: The (Fairly) True Story of Rumpelstilskin" by Liesl Shurtliff
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
