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inefficient

[in-i-fish-uh nt]
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adjective
  1. not efficient; unable to effect or achieve the desired result with reasonable economy of means.
  2. lacking in ability, incompetent.
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Origin of inefficient

First recorded in 1740–50; in-3 + efficient
Related formsin·ef·fi·cient·ly, adverb

Synonyms

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2. See incapable.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for inefficient

inefficient

adjective
  1. unable to perform a task or function to the best advantage; wasteful or incompetent
  2. unable to produce the desired result
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Derived Formsinefficiency, nouninefficiently, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for inefficient

adj.

1750, "not producing the desired effect," from in- (1) "not, opposite of" + efficient. Related: Inefficiency (1749); inefficiently.

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Online Etymology Dictionary, © 2010 Douglas Harper