borderline personality disorder
US /ˈbɔːrdərlaɪn pɜːrsəˈnælɪti dɪsˈɔːrdər/
UK /ˈbɔːrdərlaɪn pɜːrsəˈnælɪti dɪsˈɔːrdər/

1.
a mental health disorder characterized by unstable moods, behavior, and relationships
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She was diagnosed with borderline personality disorder after years of struggling with emotional instability.
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Therapy can be very effective in managing symptoms of borderline personality disorder.
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