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Adjective: lacking  la-king
  1. Inadequate in amount or degree
    "lacking in stamina";
    - deficient, wanting
  2. Nonexistent
    "her appetite was lacking";
    - absent, missing, wanting
  3. Not present or included (despite being expected, required or desired)
    "lacking in service and professionalism";
    - bereft, missing, devoid, wanting
Verb: lack  lak
  1. Be without
    "This soup lacks salt";
    - miss
  2. To be insufficiently prepared

See also: inadequate, nonexistent, unequal

Antonym: have

Encyclopedia: Lack, David