Synonyms of stupendous

1 Syllable
huge, vast, fab, fat, great, good
2 Syllables
huger, moby, monster, king-size, unreal, hugest, mondo, ripping, greatest, massy, mammoth, whaling, stunning, massiest, turn-on, superb, super, massier, whaler, smashing, utmost, wondrous
3 Syllables
enormous, gigantic, prodigious, colossal, marvelous, pythonic, titantic, terrific, fantastic, unmarred, towering, immense, surprising, breathtaking, mind-blowing, mind-boggling, staggering, radical, tremendous, towery, astounding, humungous, cyclopean, walloping, leviathan, wonderful, fabulous
4 Syllables
phenomenal, behemothic, miraculous, fantastical, spectacular, astonishing, overwhelming, monumental, dynamite, super-duper, bunyanesque, gigantesque, mastodonic, razzle-dazzle, all-embracing, infinite, wonderworking
5 Syllables
super-excellent, supertemporal, super-colossal, extraordinary, superexcellent