Pronunciation: (gran'dē-ōs"),[key] —adj. 1. affectedly grand or important; pompous: grandiose words. 2. more complicated or elaborate than necessary; overblown: a grandiose scheme. 3. grand in an imposing or impressive way.
4. Psychiatry.having an exaggerated belief in one's importance, sometimes reaching delusional proportions, and occurring as a common symptom of mental illnesses, as manic disorder.