Usually means: Lacking in some necessary aspect.
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We found 28 dictionaries that define the word deficient:

General (24 matching dictionaries)
  1. deficient: Merriam-Webster.com
  2. deficient: Oxford Learner's Dictionaries
  3. deficient: American Heritage Dictionary of the English Language
  4. deficient: Collins English Dictionary
  5. deficient: Vocabulary.com
  6. Deficient, deficient: Wordnik
  7. deficient: Cambridge Advanced Learner's Dictionary
  8. deficient: Wiktionary
  9. deficient: Webster's New World College Dictionary, 4th Ed.
  10. deficient: The Wordsmyth English Dictionary-Thesaurus
  11. deficient: Infoplease Dictionary
  12. deficient: Dictionary.com
  13. deficient: Online Etymology Dictionary
  14. deficient: Cambridge Essential American English Dictionary
  15. Deficient: Online Plain Text English Dictionary
  16. deficient: Webster's Revised Unabridged, 1913 Edition
  17. deficient: Rhymezone
  18. deficient: AllWords.com Multi-Lingual Dictionary
  19. deficient: Webster's 1828 Dictionary
  20. deficient: Free Dictionary
  21. deficient: Mnemonic Dictionary
  22. deficient: Dictionary/thesaurus

Business (1 matching dictionary)
  1. deficient: Legal dictionary

Computing (1 matching dictionary)
  1. deficient: Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. deficient: Medical dictionary

(Note: See deficiently as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
adjective:  Lacking something essential; often construed with in.
adjective:  Insufficient or inadequate in amount.
adjective:  (mathematics) Of a number n, Having the sum of divisors σ(n)<2n, or, equivalently, the sum of proper divisors (or aliquot sum) s(n) noun:  A person who is deficient.

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Types:

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Colors:
    gray,     beige,     dull brown,     pale yellow,     faded green, more...



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