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Definition of mammoth : 1. An extinct, hairy, maned elephant ( Elephas primigenius), of enormous size, remains of which are found in the northern parts of both continents. The last of the race, in Europe, were coeval with prehistoric man.
2. Resembling the mammoth in size; very large; gigantic; as, a mammoth ox.

Synonyms:

beings, leviathan, high, whopper, jumbo, behemoth, study at enormous, Titan, Goliath, monster

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

Usage examples:

• Thirteen was the original number and for the poor unfortunates who inhabited them it was most unlucky; the patients became worse, and on being taken from their subterranean homes in Mammoth Cave quickly died. - "See America First", Orville O. Hiestand.
• To the girls the cart seemed enormous; the mare of mammoth size. - "Carnival", Compton Mackenzie.
• The hide was 20 to 25 millimetres thick and nearly tanned by age, which ought not to appear wonderful, when we consider that, though the mammoth lived in one of the latest periods of the history of our globe, hundreds of thousands, perhaps millions of years have, however, passed since the animal died to which these pieces of skin once belonged. - "The Voyage of the Vega round Asia and Europe, Volume I and Volume II", A.E. Nordenskieold.