Psychopathy, or psychopathic personality, is a personality construct characterized by impaired empathy and remorse, and bold, disinhibited and egocentric traits, masked by superficial charm and the outward appearance of apparent normalcy.
Hervey M. Cleckley, an American psychiatrist, influenced the initial diagnostic criteria for antisocial personality reaction/disturbance in the Diagnostic and Statistical Manual of Mental Disorders (DSM), as did American psychologist George E. Partridge.