What is the definition of a psychopath?

Complex : Complex question to answer briefly. Lack of conscience/guilt and manipulation of others, are hallmark features. Many are charming. Psychopaths can be violent but the majority are not.

No conscience: Little to no conscience or sense of right and wrong, inability to empathize with others, a tendency to objectify people around them, longstanding pre-adolescent troubles with authority figures and the law, an in difference to social mores, impulsivity, manipulates others,and cruelty to people and animals that goes back to childhood,.