What is 'schizoid personality disorder'?

Social indifference. Schizoid personality disorder is a psychiatric condition in which a person has a lifelong pattern of indifference to others and social isolation.
Schizoid. The main feature of schizoid PD is an indifference to interpersonal relationships. These are folks who tend not to experience lonlines or depression brought on by prolonged isolation from other people. They prefer it that way.