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Personality disorders are a type of mental disorder defined by the American Psychiatric Association (DSM-IV) as "enduring patterns of inner experience and behavior that deviate markedly from the expectations of the individual's culture, are pervasive and inflexible, have an onset in adolescence or early adulthood, are stable over time, and lead to distress or impairment."
Personality disorders often inhibit a person's ability to function successfully in society, but are, by and large, not harmful to society (with certain exceptions). Megalomania, fear of interaction, belief that one is destined to be something "great," are all aspects that can lead to a diagnosis of "personality disorder."
 Anti-Social Personality Disorder
This disorder is sometimes referred to as psychopathy, with those affected called psychopaths. People with this disorder show little concern for others. They are also prone to lying. Thus these people are likely to become charlatans, shysters, and other deceitful persons.