Synonyms for La-di-da (same or very similar meaning)
WordNet sense 1 (affectedly genteel):
grandiose, highfalutin, hoity-toity, hifalutin, highfalutingWordNet sense 2 (making claim to or creating an appearance of (often undeserved) importance or distinction):
pretentiousFrom the ODE community, based on WordNetadd/edit