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Adjective: insufficient  ,in-su'fi-shunt
  1. Of a quantity not able to fulfil a need or requirement
    "insufficient funds";
    - deficient

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

Antonym: sufficient