schizoid personality disorder

n. A psychological maladjustment characterized by an enduring pattern of individual thought, behavior, and affect characterized by marked social withdrawal, minimal emotional reaction to social interactions, lack of interest in other people, and lack of satisfaction in relationships with other people. Thus the person prefers hobbies and occupations that do not involve others, prefers mechanical or abstract tasks, has a low sexual drive, and has a generally low level of pleasure in living.