psy·cho·path

[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

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
psychopath (ˈsaɪkəʊˌpæθ) [Click for IPA pronunciation guide]
 
—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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Psychopath is always a great word to know.
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a chattering or flighty, light-headed person.
a scrap or morsel of food left at a meal.
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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
He is a psychopath who works his way up the body count to the top of his own
  network of rackets.
By contrast, the psychopath functions well under pressure because he does not
  feel the moral tension at all.
Yet there is also something of the psychopath about him.
Will is wanted for the job because he has recently caught another psychopath
  and seems to have a knack for the work.
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