in·ef·fi·cient

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

Origin:
1740–50; in-3 + efficient

in·ef·fi·cient·ly, adverb


2. See incapable.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
inefficient (ˌɪnɪˈfɪʃənt) [Click for IPA pronunciation guide]
 
adj
1.  unable to perform a task or function to the best advantage; wasteful or incompetent
2.  unable to produce the desired result
 
inef'ficiency
 
n
 
inef'ficiently
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Inefficient is always a great word to know.
So is callithumpian. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Etymonline
Word Origin & History

inefficient
1750, "not producing the desired effect," from in- "not" + efficient (q.v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Proponents might argue that organizing garbage collection on a ward-by-ward
  basis is inefficient and wasteful.
It's shockingly wasteful and inefficient, but effective.
But innovation is horribly wasteful and inefficient.
In doing so, they might be making these industries more inefficient.
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