Inefficient things waste time, money, or other resources. Your old inefficient dishwasher uses much more water and electricity than a new model would. Shame on you.

Inefficient businesses have trouble making money and growing, and an inefficient city bus system might transport just a few passengers at a time. If your car is inefficient, it gets terrible gas mileage and is expensive to drive. If something is efficient, it's productive and inexpensive. Inefficient has the opposite meaning, which is clear from the "not" prefix in-.

Definitions of inefficient
  1. adjective
    not producing desired results; wasteful
    “outdated and inefficient design and methods”
    not qualified or suited for a purpose
    ineffective, ineffectual, uneffective
    not producing an intended effect
    uneconomical, wasteful
    inefficient in use of time and effort and materials
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    being effective without wasting time or effort or expense
    properly or sufficiently qualified or capable or efficient
    effective, effectual, efficacious
    producing or capable of producing an intended result or having a striking effect
    exhibiting methodical and systematic characteristics that would be useful in business
    cost-effective, cost-efficient
    productive relative to the cost
    economic, economical
    using the minimum of time or resources necessary for effectiveness
    marked by speed and efficiency
    used of gasoline; having a high octane number
    made efficient by stripping off nonessentials
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  2. adjective
    lacking the ability or skill to perform effectively; inadequate
    inefficient workers”
    synonyms: ineffective
    not qualified or suited for a purpose
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