the presence of a chronic and pervasive disposition to disregard and violate the rights of others.

Manifestations include repeated violations of the law, exploitation of others, deceitfulness, impulsivity, aggressiveness, reckless disregard for the safety of self and others, and irresponsibility, accompanied by lack of guilt, remorse, and empathy. The disorder has been known by various names, including dyssocial personality, psychopathic personality, and sociopathic personality. It is among the most heavily researched of the personality disorders and the most difficult to treat. It is included in both DSM–IV–TR and DSM–5.