IPA: /ɡrænˈdiːoʊs.nəs/
KK: /ˈɡrændiˌoʊs.nəs/
The quality of being impressive or extravagant in appearance or style, often to an exaggerated degree.
The grandioseness of the palace left the visitors in awe.
Grandioseness → It is formed from "grand" (from Old French *grand*, meaning large or great) and "-iosity" (from Latin *-ositas*, meaning the quality of being). The word "grandioseness" refers to the quality of being grand or impressive in appearance or style.
Think of something that is 'large' or 'great' ('grand') and remember that 'grandioseness' means the quality of being grand.