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Adjective: undisciplined  ,ún'di-si-plind
  1. Not subjected to discipline
    "undisciplined talent"
     
  2. Not subjected to correction or discipline
    "let her children grow up undisciplined";
    - uncorrected
     
  3. Lacking in discipline or control
    "undisciplined behaviour";
    - ungoverned

See also: jackleg [US, informal], uncontrolled, unpunished, untrained