grandiose

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Related to grandioseness: grandiosity

grandiose

 [gran´de-ōs″]
in psychiatry, pertaining to exaggerated belief or claims of one's importance or identity, often manifested by delusions of great wealth, power, or fame.

gran·di·ose

(gran'dē-ōs),
Pertaining to feelings of great importance, expansiveness, or delusions of grandeur.
[It. grandioso, fr. L. grandis, large]