Synonyms for Pretentiousness:

n.

plain, grandiosity, grandioseness. attribute (noun)
pretension.
pretentiousness (noun)
pomposity, splashiness, pretension, pompousness, inflation, ostentatiousness.
self-importance (noun)
pretension, grandioseness, grandiosity, pomposity, pompousness.

Other synonyms:

grandioseness. grandiosity. Other relevant words:
grandiosity, grandioseness.