Synonyms of efficient

efficient

adjective

i-ˈfi-shənt 

as in effective

producing or capable of producing a desired result

that manual lawn mower is not a very efficient tool for doing a huge yard

Synonyms & Similar Words

• effective
• productive
• potent
• adequate
• efficacious
• effectual
• fruitful
• operative
• useful
• capable
• practical
• skilled
• competent
• proficient
• adept
• convincing
• practiced
• skillful
• expert
• experienced
• hyperefficient
• feasible
• cogent
• dynamic
• practicable
• valid
• active
• accomplished
• striking
• veteran
• ultraefficient
• masterly
• functional
• telling
• usable
• workable
• realizable
• killer
• sound
• consummate
• applicable
• versed
• virtuoso
• working

Antonyms & Near Antonyms

• inefficient
• ineffective
• useless
• unproductive
• ineffectual
• incapable
• fruitless
• inoperative
• incompetent
• counterproductive
• unskilled
• inexperienced
• unqualified
• vain
• futile
• unfruitful
• unsuccessful
• empty
• idle
• hollow
• abortive
• unprofitable
• pointless
• worthless
• unskillful
• inexpert
• unseasoned
• inoperative
• unavailing
• bootless

Synonym Chooser

How does the adjective efficient contrast with its synonyms?

Some common synonyms of efficient are effective, effectual, and efficacious. While all these words mean "producing or capable of producing a result," efficient suggests an acting or a potential for action or use in such a way as to avoid loss or waste of energy in effecting, producing, or functioning.

an efficient small car

In what contexts can effective take the place of efficient?

While in some cases nearly identical to efficient, effective stresses the actual production of or the power to produce an effect.

an effective rebuttal

When would effectual be a good substitute for efficient?

The words effectual and efficient are synonyms, but do differ in nuance. Specifically, effectual suggests the accomplishment of a desired result especially as viewed after the fact.

the measures to stop the pilfering proved effectual

Where would efficacious be a reasonable alternative to efficient?

The synonyms efficacious and efficient are sometimes interchangeable, but efficacious suggests possession of a special quality or virtue that gives effective power.

a detergent that is efficacious in removing grease

Example Sentences

Recent Examples of efficient

China is working to make heavy industry more energy efficient and pushing to electrify heavy vehicles. — Jennifer McDermott, Los Angeles Times, 23 Sep. 2026

Dickey has built on Scholes’ work to pin down network properties that produce quantumlike states and is working to find computationally efficient ways to produce them. — Elise Cutts, Quanta Magazine, 23 Sep. 2026

Today, almost 160 years since Twain’s account of his trip was first published, global travel has become astoundingly more accessible, efficient, and interconnected. — Cnt Editors, Condé Nast Traveler, 22 Sep. 2026

But for certain parts of agentic tasks, CPUs are more efficient than their GPU counterparts. — Natasha Abellard, CNBC, 22 Sep. 2026