Synonyms of colossal

1 Syllable

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

2 Syllables

bulkier, bigger, highland, huger, massy, hefty, massiest, biggest, bulkiest, moby, monstrous, vaster, buller, king-size, hulky, spread-out, whaling, jumbo, whaler, macro, mondo, ripping, hugest, bulky, heftier, hulking, super, greatest, whopping, mammoth, vastest, massier

3 Syllables

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

4 Syllables

astronomic, super-duper, bunyanesque, brobdingnagian, gigantesque, mastodonic, large-scale, behemothic, monolithic, larger-than-life

5 Syllables

elephantine, super-colossal, astronomical