psychopath

[sahy-kuh-path]
noun
a person with a psychopathic personality, which manifests as amoral and antisocial behavior, lack of ability to love or establish meaningful personal relationships, extreme egocentricity, failure to learn from experience, etc.
Compare sociopath.


Origin:
1880–85; psycho- + -path

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
psychopath (ˈsaɪkəʊˌpæθ)
 
n
Also called: sociopath a person afflicted with a personality disorder characterized by a tendency to commit antisocial and sometimes violent acts and a failure to feel guilt for such acts
 
psycho'pathic
 
adj
 
psycho'pathically
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

psychopath psy·cho·path (sī'kə-pāth')
n.
A person with an antisocial personality disorder, especially one manifested in perverted, criminal, or amoral 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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American Heritage
Cultural Dictionary
psychopath [(seye-kuh-path)]

A mentally unbalanced person who is inclined toward antisocial and criminal behavior. (Compare sociopath.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
These are the categories that used to be called sociopath and psychopath.
Yet there is also something of the psychopath about him.
And one doesn't have to be a full-fledged psychopath to share some of the
  psychopath's antisocial propensities.
It's difficult to empathize with, let alone have sympathy for, a psychopath.
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