Grandiosity
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. and also occurs in Reactive Attachment Disorder.
Grandiosity is chiefly associated with narcissistic personality disorder, but also commonly features in manic or hypomanic episodes of bipolar disorder.
In narcissism
Pathological grandiosity has been associated with one of the two subtypes of Narcissistic Personality Disorder. (Gabbard, 1989) Characteristics of the narcissist-grandiose subtype (as opposed to the narcissist-vulnerable subtype) include:
Being labeled the “oblivious narcissists”
Observed lack of insight into the impact they have on others
More likely to regulate self-esteem through overt self-enhancement
Denial of weaknesses