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Definition of gargantuan : Characteristic of Gargantua, a gigantic, wonderful personage; enormous; prodigious; inordinate.

Synonyms:

Herculean, monster, monumental, Brobdingnagian, mastodonic, whopping, pythonic, Bunyanesque, behemoth, monstrous, walloping, Cyclopean, heroic, jumbo, gigantesque, stupendous, mountainous, titanic, mighty, massy

extensive, sizable, ample, lofty, magnificent, colossal, soaring, majestic, giant, enormous, big, voluminous, immense, huge, copious, awesome, gigantic, generous, expansive, baggy, large, bulky, capacious, impressive, towering, grandiose, cavernous, mammoth, comprehensive, tremendous, prodigious, roomy, vast, massive, humongous, elephantine, grand, princely, spacious, great

Usage examples:

• Such Gargantuan smugness takes one's breath away. - "The Keeper of the Door", Ethel M. Dell.
• Evidently the captain meant to add certain explanatory remarks which would account for that Gargantuan tickling. - "The Wheel O' Fortune", Louis Tracy.
• Johnson at midnight outside the Temple roaring with Gargantuan laughter that echoed from Temple Bar to what we now call Ludgate Circus is a picture his wisest admirers would be slowest to forget. - "Dr. Johnson and His Circle", John Bailey.