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Adjective deficient has 3 senses
  1. deficient, lacking, wanting - inadequate in amount or degree; "a deficient education"; "deficient in common sense"; "lacking in stamina"; "tested and found wanting"
    Antonym: adequate (indirect, via inadequate)
  2. insufficient, deficient - of a quantity not able to fulfill a need or requirement; "insufficient funds"
  3. deficient, inferior, substandard - falling short of some prescribed norm; "substandard housing"
    Antonym: standard (indirect, via nonstandard)
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