gargantuan

Synonyms

astronomical (also astronomic), bumper, colossal, cosmic (also cosmical), elephantine, enormous, galactic, giant, gigantic, grand, herculean, heroic (also heroical), huge, humongous (also humungous), immense, jumbo, king-size (or king-sized), leviathan, mammoth, massive, mega, mighty, monster, monstrous, monumental, mountainous, oceanic, planetary, prodigious, super, supersize, supersized, titanic, tremendous, vast, vasty, walloping, whacking, whopping;

Antonyms

bantam, bitty, diminutive, infinitesimal, little bitty, micro, microminiature, microscopic (also microscopical), midget, miniature, minuscule, minute, pocket, pygmy, teensy, teensy-weensy, teeny, teeny-weeny, tiny, wee;

Near Antonyms

little, mini, petite, pint-size (or pint-sized), puny, small, smallish, undersized (also undersize);

dinky, dwarfish, half-pint;

Related Words

big, bulky, considerable, extensive, good, goodly, great, gross, handsome, hefty, hulking, largish, major, outsize (also outsized), overgrown, oversize (or oversized), sizable (or sizeable), substantial, tidy, voluminous;

august, formidable, grandiose, imposing, lofty, majestic;

cavernous, monolithic, overwhelming, staggering, stupendous, towering;

boundless, immeasurable, infinite;