Personality disorder is a deeply ingrained pattern of behaviour of a specified kind that deviates markedly from the norms of generally accepted behaviour, typically apparent by the time of adolescence, and causing long-term difficulties in personal relationships or in functioning in society.
"this personality disorder is characterized by a lack of guilt and an inability to form lasting relationships."
The types are grouped into three categories: Suspicious – paranoid, schizoid, schizotypal and antisocial. Emotional and impulsive – borderline, histrionic and narcissistic. Anxious – avoidant, dependent and obsessive compulsive.