Grandiosity refers to an unrealistic sense of superiority—-a sustained view of oneself as better than others that causes the narcissist to view others with disdain or as inferior—-as well as to a sense of uniqueness: the belief that few others have anything in common with oneself and that one can only be understood by a few or very special people.
Grandiosity is chiefly associated with narcissistic personality disorder, but also commonly features in manic or hypomanic episodes of bipolar disorder. --Wiki
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