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Adjective: deficient  di'fi-shunt
  1. Inadequate in amount or degree
    "a deficient education"; "deficient in common sense";
    - lacking, wanting
  2. Falling short of some prescribed norm
    "deficient housing";
    - inferior, substandard
  3. Of a quantity not able to fulfil a need or requirement
    "deficient funds";
    - insufficient

See also: depleted, inadequate, jejune, lean, light, low, meager [N. Amer], meagerly [N. Amer], meagre [Brit, Cdn], meagrely [Brit, Cdn], nonstandard, poor, quantity, scant, scrimpy, short, shy, skimpy, stingy [informal], unequal