psychopathic

from WordNet (r) 3.0 (2006)

psychopathic
    adj 1: suffering from an undiagnosed mental disorder [syn:
           {psychopathic}, {psychopathologic}, {psychopathological}]

from The Collaborative International Dictionary of English v.0.48

Psychopathy \Psy*chop"a*thy\, n. [Psycho- + Gr. ?, ?.] (Med.)
   Mental disease. See {Psychosis}, 2. -- {Psy`cho*path"ic}, a.
   -- {Psy*chop"a*thist}, n.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

30 Moby Thesaurus words for "psychopathic":
      brain-damaged, brain-injured, catatonic, certifiable, disturbed,
      functional, manic-depressive, mentally ill, mentally sick,
      neuropsychiatric, neurotic, paranoiac, paranoid, psychiatric,
      psychobiological, psychodynamic, psychogenic, psychological,
      psychoneurological, psychopathological, psychophysical,
      psychophysiological, psychosexual, psychosocial, psychosomatic,
      psychotic, schiz, schizoid, schizophrenic, schizy