'Deficient' definitions:

Definition of 'deficient'

(from WordNet)
adjective
Inadequate in amount or degree; "a deficient education"; "deficient in common sense"; "lacking in stamina"; "tested and found wanting" [syn: deficient, lacking(p), wanting(p)]
adjective
Of a quantity not able to fulfill a need or requirement; "insufficient funds" [syn: insufficient, deficient] [ant: sufficient]
adjective
Falling short of some prescribed norm; "substandard housing" [syn: deficient, inferior, substandard]

Definition of 'Deficient'

From: GCIDE
  • Deficient \De*fi"cient\, a. [L. deficiens, -entis, p. pr. of deficere to be wanting. See Defect.] Wanting, to make up completeness; wanting, as regards a requirement; not sufficient; inadequate; defective; imperfect; incomplete; lacking; as, deficient parts; deficient estate; deficient strength; deficient in judgment. [1913 Webster]
  • The style was indeed deficient in ease and variety. --Macaulay. [1913 Webster]
  • Deficient number. (Arith.) See under Abundant. -- {De*fi"cient-ly}, adv. [1913 Webster]