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Adjective inefficient has 2 senses
- inefficient - not producing desired results; wasteful; "an inefficient campaign against drugs"; "outdated and inefficient design and methods"
Antonyms: efficient, businesslike, cost-efficient, cost-effective, economic, economical, expeditious, prompt, timesaving, high-octane, streamlined, underspent
- ineffective, inefficient - lacking the ability or skill to perform effectively; inadequate; "an ineffective administration"; "inefficient workers"
Antonym: competent (indirect, via incompetent)
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