Psychopathy is traditionally a personality disorder characterized by persistent antisocial behavior, impaired empathy and remorse, and bold, disinhibited, and egotistical traits. It is sometimes considered synonymous with sociopathy. Different conceptions of psychopathy have been used throughout history that are only partly overlapping and may sometimes be contradictory.

Psychopathy is a condition characterized by the absence of empathy and the blunting of other affective states. Callousness, detachment and a lack of empathy enable psychopaths to be highly manipulative. Nevertheless, psychopathy is among the most difficult disorders to spot. Psychopaths can appear normal, even charming. Underneath, they lack any semblance of conscience. Their antisocial nature inclines them often (but by no means always) to criminality.