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Adjective: inadequate  in'a-di-kwut
  1. Lacking the requisite qualities or resources to meet a task
    "inadequate training"; "the staff was inadequate";
    - unequal
  2. Of insufficient quantity to meet a need
    "an inadequate income";
    - poor, short, jejune

See also: adequacy, adequateness, deficient, incapable, incompetent, insufficient, lacking, short-handed, short-staffed, undermanned, understaffed, unequal to, unsatisfactory, wanting

Antonym: adequate