affectedly grand or important; pompous

grandiose words.

more complicated or elaborate than necessary; overblown

a grandiose scheme.

grand in an imposing or impressive way.

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.

noun

grandeur , grandness , greatness , majesty , splendor , grandioseness , ostentation , pomposity , pompousness , pretension