Synonyms of colossal in English:
a colossal building
huge, massive, enormous, gigantic, very big, very large, great, giant, mammoth, vast, cosmic, immense, tremendous, mighty, stupendous, monumental, epic, prodigious, mountainous, monstrous, titanic, towering, elephantine, king-sized, king-size, gargantuan, Herculean, Brobdingnagian;
substantial, extensive, hefty, bulky, weighty, heavy, gross
informalmega, monster, whopping, whopping great, thumping, thumping great, humongous, jumbo, hulking, bumper, astronomical, astronomic
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