academic (also academical), donnish, inkhorn, pedantic, scholastic

belletristic (also belle-lettristic)

highbrow, highbrowed, intellectual

educated, schooled

elevated, eloquent, formal, high-flown, lofty, majestic, stately, towering

bombastic, declamatory, florid, flowery, grandiloquent, highfalutin (also hifalutin), pompous, stilted