Synonyms of gigantic

1 Syllable

blimp, high, huge, great, gross, vast, big, giant

2 Syllables

bigger, highland, huger, massy, massiest, biggest, moby, monster, monstrous, vaster, buller, king-size, untold, spread-out, whaling, jumbo, whopping, whaler, hugest, mondo, hulking, titan, greatest, mammoth, vastest, massier

3 Syllables

tremendous, towery, sizeable, terrific, mountainous, humungous, cyclopean, pythonic, towering, gargantuan, stretched-out, enormous, ginormous, prodigious, stupendous, walloping, immense, herculean, colossal, leviathan, sky-scraping, massive

4 Syllables

monumental, astronomic, super-duper, bunyanesque, brobdingnagian, gigantesque, mastodonic, large-scale, monolithic, behemothic

5 Syllables

elephantine, super-colossal, astronomical, unnumberable