Prodigious1. (a.) Of the nature Of a prodigy; marvelous; great in size or force; as a prodigious storm.
2. (a.) Extraordinary in bulk, extent, quantity, or degree; very great; vast; huge; immense; as, a prodigious mountain; a prodigious creature; a prodigious blunder.
Thesaurus Entries
Atlantean, Brobdingnagian, Cyclopean, Gargantuan, Herculean, Homeric, abysmal, amazing, amplitudinous, astonishing, astounding, astronomic, astronomical, awesome, beguiling, bewildering, bewitched, boundless, bulky, colossal, cosmic, cracking, cyclopean, dumbfounding, elephantine, enchanted, enigmatic, enormous, epic, exceptional, extensive, extraordinary, fabulous, fantastic, fascinating, flabbergasting, galactic, gargantuan, giant, giantlike, gigantic, heroic, huge, humongous, immeasurable, immense, incomprehensible, inconceivable, incredible, indescribable, ineffable, infinite, jumbo, king-size, large, legendary, leviathan, magical, mammoth, marvelous, massive, massy, mighty, mind-blowing, mind-boggling, miraculous, monster, monstrous, monumental, mortal, mountainous, mythical, necromantic, notable, noteworthy, outlandish, outsize, overgrown, passing strange, phenomenal, portentous, profound, puzzling, rare, remarkable, sensational, sizable, spacious, spectacular, staggering, startling, strange, striking, stupefying, stupendous, surprising, thaumaturgic, titanic, towering, tremendous, unexampled, unheard-of, unimaginable, unique, unparalleled, unprecedented, unspeakable, unusual, vast, voluminous, weighty, wonder-working, wonderful, wondrous