noun
a person suffering from chronic mental disorder with abnormal or violent social behavior
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The psychologist diagnosed the patient as a psychopath based on his behavior and lack of empathy.
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I heard that guy is a total psychopath, you better watch out around him.
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Don't trust that dude, he's a straight-up psycho.
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Her obsession with power and control made her seem like a psychopath in the business world.