psychopath
//ˈsaɪ.kə.pæθ//
Noun
psychopathSingular
psychopathsPlural
1
A person suffering from a chronic mental disorder characterized by abnormal or violent social behavior, lack of empathy, and disregard for the rights of others.
The detective suspected that the killer was a psychopath who felt no remorse for his crimes.
2
(informal) A person who behaves in a cruel, manipulative, or dangerously antisocial manner.
My ex-boyfriend was a complete psychopath who tried to control every aspect of my life.