Antisocial personality disorder (also known as dissocial personality disorder) is characterized by a pervasive pattern of disregard for, or violation of, the rights of others. An impoverished moral sense or conscience is apparent, as well as a history of crime, legal problems, and/or impulsive and aggressive behavior.

Antisocial personality disorder (ASPD) is the name of the disorder as defined in the Diagnostic and Statistical Manual (DSM). Dissocial personality disorder is the name of a similar or equivalent concept defined in the International Statistical Classification of Diseases and Related Health Problems (ICD), where it states that the diagnosis includes antisocial personality disorder. Both manuals have similar but not identical criteria. Both have also stated that their diagnoses have been referred to, or include what is referred to, as psychopathy or sociopathy, though distinctions are sometimes made.

Diagnosis

DSM IV-TR

The APA's Diagnostic and Statistical Manual of Mental Disorders, fourth edition, text revision (DSM IV-TR), defines antisocial personality disorder (Cluster B):

Personality disorders are a class of mental disorders characterized by enduring maladaptive patterns of behavior, cognition, and inner experience, exhibited across many contexts and deviating markedly from those accepted by the individual's culture. These patterns develop early, are inflexible, and are associated with significant distress or disability. The definitions may vary somewhat, according to source.

Official criteria for diagnosing personality disorders are listed in the Diagnostic and Statistical Manual of Mental Disorders, published by the American Psychiatric Association, and in the mental and behavioral disorders section of the International Statistical Classification of Diseases and Related Health Problems, published by the World Health Organization. The DSM-5 published in 2013 now lists personality disorders in exactly the same way as other mental disorders, rather than on a separate 'axis' as previously.

Personality, defined psychologically, is the set of enduring behavioral and mental traits that distinguish human beings. Hence, personality disorders are defined by experiences and behaviors that differ from societal norms and expectations. Those diagnosed with a personality disorder may experience difficulties in cognition, emotiveness, interpersonal functioning, or impulse control. In general, personality disorders are diagnosed in 40–60 percent of psychiatric patients, making them the most frequent of all psychiatric diagnoses.