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Adjective: psychopathic  ,sI-ku'pa-thik
  1. Relating to or characterized by psychopathy, especially showing antisocial behaviour and lack of empathy
    "The author deals with a most difficult problem which is the psychiatric treatment of the psychopathic offender";
    - psychopathologic, psychopathological, psycho [informal]

See also: insane

Encyclopedia: Psychopathic