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Definitions

powerful

[pou-er-fuhl] / ˈpaʊ ər fəl /
ADJECTIVE
strong, effective
Synonyms
STRONGEST
all-powerful authoritative capable compelling dominant dynamic energetic forceful impressive influential mighty persuasive potent robust vigorous
WEAK
able almighty authoritarian big-wheel cogent commanding competent controlling convincing effectual efficacious forcible in control in the saddle omnipotent overruling paramount preeminent prevailing puissant ruling sovereign stalwart strapping strengthy sturdy supreme telling upper hand weighty wicked wieldy
Antonyms
STRONGEST
idle impotent inactive incapable ineffective ineffectual insignificant lethargic unimportant weak
WEAK
unable

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.

Because photons move faster and do not have mass like electrons, devices based on light could become both quicker and smaller, opening the door to more powerful and compact technologies.

From Science Daily • Apr. 5, 2026

A flurry of powerful attacks had internet experts baffled.

From The Wall Street Journal • Apr. 4, 2026

Gen Soleimani, who was Iran's most powerful military commander, was killed in 2020 in a US air strike in Iraq which was ordered by then US President Donald Trump.

From BBC • Apr. 4, 2026

Clement “was fascinated by powerful businessmen,” Bartholomew added, and he “appears to have further believed that their very names are puns that reveal God’s purposes.”

From Salon • Apr. 4, 2026

I decided to win her over with my charm, so I smiled up at her with a powerful grin that showed all my teeth.

From "The Detective's Assistant" by Kate Hannigan

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.