Englishgigantic
adjective
the college is a gigantic Victorian building:
huge, enormous, vast, extensive, expansive, broad, wide;
very big/large, great, giant, massive, colossal, mammoth, immense, tremendous, mighty, stupendous, monumental;
boundless, immeasurable, limitless, infinite, cosmic;
epic, prodigious, mountainous, monstrous, titanic, towering, elephantine, king-sized, king-size, gargantuan, Herculean, Brobdingnagian, substantial;
informal mega, monster, whopping, whopping great, thumping, thumping great, humongous, jumbo, hulking, bumper, astronomical, astronomic;
British, informal whacking, whacking great, ginormous.
▷antonyms tiny.
gigantic Oxford Dictionary of English