psychopathy

[sahy-kop-uh-thee]
noun, plural psychopathies. Psychiatry.
1.
a mental disorder in which an individual manifests amoral and antisocial behavior, lack of ability to love or establish meaningful personal relationships, extreme egocentricity, failure to learn from experience, etc.
2.
any mental disease.

Origin:
1840–50; psycho- + -pathy

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Collins
World English Dictionary
psychopathy (saɪˈkɒpəθɪ)
 
n
1.  another name for psychopathic personality
2.  any mental disorder or disease

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

psychopathy psy·chop·a·thy (sī-kŏp'ə-thē)
n.
Mental disorder, especially when manifested by antisocial behavior.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The groups were tested for antisocial personality disorder, psychopathy, and
  aggression.
Psychopathy is different from sociopathy, though this is much less exciting
  than saying mean people are psychos.
Yet these populations had names for disorders that appeared strikingly similar
  to schizophrenia, alcoholism and psychopathy.
It's the difference between sociopathy and psychopathy.
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