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.
Psychopathy can simply be defined as a chronic mental disorder comprised of abnormal and violent social behaviors with little or no remorse or guilt.
The term 'psychopath' is not an official diagnosis. Instead a doctor may diagnose someone with specific traits they associate with antisocial personality disorder (ASPD) like lack of empathy, remorse and persistent antisocial behavior.