Individuals exhibit a pervasive pattern of indifference to social relationships and a restricted range of emotional experience and expression, beginning by early adulthood and present in a variety of contexts.

Schizoid personality disorder (, often abbreviated as SzPD or ScPD) is a personality disorder characterized by a lack of interest in social relationships, a tendency toward a solitary or sheltered lifestyle, secretiveness, emotional coldness, detachment, and apathy. Affected individuals may be unable to form intimate attachments to others and simultaneously possess a rich and elaborate but exclusively internal fantasy world...