Thesaurus

Synonyms for Massive include:

ample, astronomic, astronomical, banging, bear-sized, big, bigger, biggish, blown-up, bouffant, broad, Brobdingnagian, bulky, capacious, colossal, cosmic, deep, dense, double, doughy, elephantine, enlarged, enormous, epic, extended, extensive, full-size, galactic, gargantuan, giant, gigantic, grand, great, heavier-than-air, heavy, hefty, heroic, huge, hulking, hulky, humongous, immense, jumbo, king-size, king-sized, large, large-mouthed, large-scale, larger, larger-than-life, largish, life-size, life-sized, lifesize, macro, mammoth, man-sized, massive, medium-large, monolithic, monstrous, monumental, mountainous, non-buoyant, outsize, outsized, overlarge, oversize, oversized, plumping, ponderous, prodigious, puffy, queen-size, queen-sized, rangy, sizable, sizeable, soggy, solid, spacious, stupendous, super, thumping, titanic, too large, tremendous, vast, volumed, voluminous, walloping, whacking, whopping, wide, wide-ranging

massive is a ADJ.