Definitions

efficiency

[ih-fish-uhn-see] / ɪˈfɪʃ ən si /

NOUN

adeptness, effectiveness

Synonyms

STRONGEST

ability adaptability capability competence energy expertise performance productivity readiness skill talent

STRONG

abundance address adequacy capableness competency completeness economy effectualness efficacy facility faculty know-how potency power powerfulness productiveness proficiency prowess quantity resourcefulness response skillfulness suitability suitableness thoroughness

Antonyms

STRONGEST

idleness ignorance impotence inability inadequacy incapability incapacity incompetence ineptness weakness

STRONG

inefficiency lack

WEAK

helplessness ineffectiveness

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.

Comer supported Musk’s work on the Department of Government Efficiency last year, which included targeting nonprofits accused of fraud.

From The Wall Street Journal • May 12, 2026

The same claims have been made by billionaire and former Department of Government Efficiency head Elon Musk, and podcast host former white house adviser Steve Bannon.

From Salon • Apr. 14, 2026

Efficiency gains had offset population growth and industrial demand stayed subdued.

From MarketWatch • Apr. 8, 2026

Reform made quite a big deal of setting up its own version last year of Donald Trump's Doge - the Department of Government Efficiency - with Yusuf leading it until recently.

From BBC • Feb. 4, 2026

Efficiency, even military efficiency, is no longer needed.

From "1984" by George Orwell

Vocabulary lists containing efficiency

Word Generation Science - Energy

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"The Veldt" by Ray Bradbury

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The Boy in the Striped Pajamas

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