Synonyms for Pretentiousness (same or very similar meaning)
WordNet sense 1 (lack of elegance as a consequence of being pompous and puffed up with vanity):
inflation, ostentation, pomposity, pompousness, puffiness, splashiness, ostentatiousnessWordNet sense 2 (the quality of being pretentious (behaving or speaking in such a manner as to create a false appearance of great importance or worth)):
largeness, pretensionFrom the ODE community, based on WordNetadd/edit