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Synonyms
de·fi·cient (dĭ-fĭsh́ənt)

[Latin dēficiēns, dēficient- present participle of dēficere, to fail, be wanting; see defect.]

adjective 

  1. Lacking an essential quality or element: deficient in common sense.
  2. Inadequate in amount or degree; insufficient: a deficient education.

derivatives

de·fícient
noun
de·fícient·ly
adverb