Grandiosity

2 clues
Hugeness, to Mr. Fancy Pants
Pretentiously imposing style
Similar answers:
Adamsgrandson
Aggrandize
Agrand
Ahundredgrandam
Aintlovegrand
Arianagrande
Babygrand
Babygrandpianos
Babygrands
Camarograndprix
Careergrandslam
Centralgrand
Concertgrand
Concertgrands
Curiogrande
Curiosity
Curiositykilledthedog
Curiosityshops
Delgrande
Dirtygrandpa