Open English Wordnet
Adjectives
(s)portentous, prodigiousof momentous or ominous significance“such a portentous … monster raised all my curiosity” (Herman Melville), “a prodigious vision”
(s)grandiloquent, overblown, pompous, pontifical, portentouspuffed up with vanity“a grandiloquent and boastful manner”, “overblown oratory”, “a pompous speech”, “pseudo-scientific gobbledygook and pontifical hooey” (Newsweek)