colossal, prodigious, stupendous -- (so great in size or force or extent as to elicit awe; "colossal crumbling ruins of an ancient temple"; "has a colossal nerve"; "a prodigious storm"; "a stupendous field of grass"; "stupendous demand")
portentous, prodigious -- (of momentous or ominous significance; "such a portentous...monster raised all my curiosity"- Herman Melville; "a prodigious vision")
exceeding, exceptional, olympian, prodigious, surpassing -- (far beyond what is usual in magnitude or degree; "a night of exceeding darkness"; "an exceptional memory"; "olympian efforts to save the city from bankruptcy"; "the young Mozart's prodigious talents")
(Sound)
