Personality disorder: a deeply ingrained and maladaptive pattern of behavior of a specified kind, typically manifest by the time one reaches adolescence and causing long-term difficulties in personal relationships or in functioning in society.
Narcissistic personality disorder Narcissistic personality disorder is a mental disorder in which people have an inflated sense of their own importance, a deep need for admiration and a lack of empathy for others. But behind this mask of ultraconfidence lies a fragile self-esteem that's vulnerable to the slightest criticism.
We've all come across people exhibiting narcissistic behavior, which may contribute to people's overinflated thoughts of their appearances or achievements.
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