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

If housekeeping loses time because the plan is inefficient, the guest feels it. — Wyles Daniel, USA Today, 18 Aug. 2026

Earth’s atmosphere makes ion propulsion inefficient for practical daily flight. — Mrigakshi Dixit, Interesting Engineering, 17 Aug. 2026

The idea that government, which has been defined as incompetent and inefficient for decades, could provide grocery abundance and variety better than Walmart and Costco has triggered a visceral reaction among critics. — Nathaniel Meyersohn, CNN Money, 15 Aug. 2026

Companies would not respond to an inefficient manufacturing operation simply by purchasing more machinery. — Eugene Litvak, Fortune, 15 Aug. 2026