Synonyms of inefficient

inefficient

adjective

ˌi-nə-ˈfi-shənt 

as in unsuccessful

not producing the desired result

inefficient measures to solve the problem of teenage smoking

Synonyms & Similar Words

• unsuccessful
• ineffective
• counterproductive
• ineffectual
• inexpedient
• worthless
• useless
• feckless
• unprofitable
• pointless
• futile
• unproductive
• nonproductive
• inefficacious
• abortive
• unavailing
• hamstrung
• fruitless
• profitless
• bootless

Antonyms & Near Antonyms

• efficient
• effective
• expedient
• efficacious
• effectual
• operant
• successful
• beneficial
• useful
• profitable
• helpful
• productive
• worthwhile
• ultraefficient
• availing

Example Sentences

Recent Examples of inefficient

Failing to do so can make for a clunky, inefficient shift and wear down components over time. — ArsTechnica, 26 Aug. 2026

Most clinic patients do not speak English, and caring for them via translation is challenging and inefficient. — Benjamin I. Lee, STAT, 24 Aug. 2026

But using steam for this is inefficient, and lately several companies have been experimenting with novel electrical approaches. — Emily Waltz, IEEE Spectrum, 19 Aug. 2026

The issue in his game is his reads, inefficient movements and lack of consistency. — Corey Pronman, New York Times, 18 Aug. 2026