Gargantuan | Definition of gargantuan by Merriam-Webster

Full Definition of GARGANTUAN

: tremendous in size, volume, or degree : gigantic, colossal <gargantuan waterfalls>

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Gargantua

First Known Use: 1596

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

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

: extremely large or great : huge <a gargantuan dinosaur>

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