borderline personality disorder
in DSM–IV–TR and DSM–5, a personality disorder characterized by a long-standing pattern of instability in mood, interpersonal relationships, and self-image that is severe enough to cause extreme distress or interfere with social and occupational functioning. Among the manifestations of this disorder are (a) self-damaging behavior (e.g., gambling, overeating, substance use); (b) intense but unstable relationships; (c) uncontrollable temper outbursts; (d) uncertainty about self-image, gender, goals, and loyalties; (e) shifting moods; (f) self-defeating behavior, such as fights, suicidal gestures, or self-mutilation; and (g) chronic feelings of emptiness and boredom. See also mentalization.