borderline personality disorder
noun
: a personality disorder that is marked by unstable, intense emotions and mood with symptoms including instability in interpersonal relationships and self-image, fear of abandonment, and impulsive or unpredictable behavior and that has an onset during adolescence or early adulthood
Like others with borderline personality disorder, she had intense and unstable relationships with people that veered from adoration to intense hatred and jealousy the moment she felt the merest slight.—Richard A. Friedman
Borderline personality disorder afflicts an estimated 1.3 percent of U.S. adults.—Bruce Bower
—abbreviation BPD
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Merriam-Webster unabridged
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