not doing a job well and not making the best use of time, money, energy, etc. an inefficient heating system inefficient management an extremely inefficient secretary inefficient use of time and energy opposite efficient
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NAmE//ˌɪnɪˈfɪʃənsi//
noun [uncountable, countable] (pl. inefficiencies) waste and inefficiency in government inefficiencies in the system adverbSee inefficient in the Oxford Advanced Learner's Dictionary
Check pronunciation: inefficient