personality disorder
US /ˌpɜːr.sənˈæl.ə.t̬i dɪsˈɔːr.dɚ/
UK /ˌpɜːr.sənˈæl.ə.t̬i dɪsˈɔːr.dɚ/

1.
a mental disorder characterized by deeply ingrained, inflexible patterns of thinking, feeling, and behaving that deviate markedly from the expectations of the individual's culture, causing distress or impairment in social, occupational, or other important areas of functioning
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Borderline personality disorder is a complex mental health condition.
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Treatment for personality disorders often involves psychotherapy.