WordNet sense 1 (proceeding from or ordered by or subject to a pope or the papacy regarded as the successor of the Apostles):

apostolic, papal, apostolical

WordNet sense 2 (denoting or governed by or relating to a bishop or bishops):

episcopal

WordNet sense 3 (puffed up with vanity):

grandiloquent, overblown, pompous, portentous

WordNet sense 4 (making claim to or creating an appearance of (often undeserved) importance or distinction):

pretentious