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

The doctor argued that one strategy to more effectively organize the health system would be to implement new technology, noting that Venezuela still uses an inefficient paper-record system. — Alfie Pannell, Miami Herald, 23 July 2026

State and local governments also usually have programs that help residents insulate their homes and upgrade inefficient appliances. — Destenie Nock, The Conversation, 22 July 2026

Typically, manufacturing these diamond processors has been inefficient, with industry conversion yields hovering around a dismal one percent to 10 percent. — Mrigakshi Dixit, Interesting Engineering, 21 July 2026

An older home layout or an inefficient layout can force your air conditioner to run longer than necessary, driving up your cooling costs. — Timothy Dale, The Spruce, 17 July 2026