lacking some element or characteristic; defective: deficient in taste.
insufficient; inadequate: deficient knowledge.
a person who is deficient, especially one who is mentally defective.

1575–85; < Latin dēficient- (stem of dēficiēns, present participle of dēficere to fail, run short, lack, weaken), equivalent to dē- de- + fic-, combining form of facere to make, do1 + thematic -i- + -ent- -ent

deficiently, adverb
nondeficient, adjective
nondeficiently, adverb
predeficient, adjective
predeficiently, adverb
undeficient, adjective
undeficiently, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
deficient (dɪˈfɪʃənt)
1.  lacking some essential; incomplete; defective
2.  inadequate in quantity or supply; insufficient
[C16: from Latin dēficiēns lacking, from dēficere to fall short; see defect]

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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Word Origin & History

1580s, from L. deficientem (nom. deficiens), prp. of deficere "to desert, fail," from de- "down, away" + facere "to do, perform" (see factitious).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

deficient de·fi·cient (dĭ-fĭsh'ənt)

  1. Lacking an essential quality or element.

  2. Inadequate in amount or degree; insufficient.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The two deficient enzymes mentioned in the article are products of genes being
  read and proteins being synthesized.
Being different does not mean one is deficient.
Others blame deficient demand for the country's stubbornly high unemployment.
One of every four bridges nationwide is either structurally deficient or
  functionally obsolete.
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