Synonyms for Grandiose (same or very similar meaning)
WordNet sense 1 (affectedly genteel):
highfalutin, hoity-toity, la-di-da, hifalutin, highfalutingWordNet sense 2 (making claim to or creating an appearance of (often undeserved) importance or distinction):
pretentiousWordNet sense 3 (making a strong or vivid impression):
impressiveFrom the ODE community, based on WordNetadd/edit