Antisocial Behavior

noun a person suffering from chronic mental disorder with abnormal or violent social behavior

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

noun a mental disorder characterized by persistent antisocial behavior, impaired empathy and remorse, and bold, disinhibited, egotistical traits

• Psychopathy is a personality disorder characterized by persistent antisocial behavior, impaired empathy, and bold, disinhibited traits.
• Some people believe that psychopathy is just a fancy word for being a really mean person.
• Dude, that guy is totally a psychopath - he has no regard for anyone else's feelings.
• The company's ruthless pursuit of profit could be seen as a form of corporate psychopathy.