(a.) Astonishing; wonderful; amazing; especially, astonishing in magnitude or elevation; as, a stupendous mount\.

Atlantean Brobdingnagian Cyclopean Gargantuan Herculean Homeric abysmal amazing amplitudinous astonishing astounding astronomic astronomical awesome beguiling bewildering boundless bulky colossal cosmic cracking elephantine enigmatic enormous epic exceptional extensive extraordinary fabulous fantastic fascinating galactic giant giantlike gigantic heroic huge immeasurable immense incomprehensible inconceivable incredible indescribable ineffable infinite jumbo king-size large legendary mammoth marvelous massive massy mighty miraculous monster monstrous monumental mortal mountainous mythical noteworthy outlandish outsize overgrown passing strange phenomenal portentous prodigious profound puzzling rare remarkable sensational sizable spacious spectacular staggering strange striking stupefying titanic towering tremendous unexampled unheard-of unimaginable unique unparalleled unprecedented unspeakable vast voluminous weighty wonderful wondrous