Grandiose (adjective)

1. Impressively large, elaborate, or extravagant.
2. Affectedly grand or important.

Origin:

From latin grandiosus, from grandis ("big, grea.t")

Examples:

1. The grandiose palace was built to showcase the wealth and power of the royal family.
2. He had a grandiose idea of himself, imagining that he was destined for greatness.
3. She gave a grandiose speech at the ceremony, filled with lofty rhetoric and grand promises.
4. The grandiose wedding was a spectacle, with fireworks and live music.
5. He had a grandiose plans for his future, but they never came to fruition.