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Definition of gigantic : 1. Of extraordinary size; like a giant.
2. Such as a giant might use, make, or cause; immense; tremendous; extraordinarly; as, gigantic deeds; gigantic wickedness.

Synonyms:

Brobdingnagian, monster, heroic, abundant, study at enormous, massy, considerable, gigantesque, behemoth, jumbo, monumental, Cyclopean, pythonic, monstrous, coarse, mastodonic, Bunyanesque, mighty, broad, walloping, titanic, mountainous, whopping, Herculean, long, commodious, wide, stupendous

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

Usage examples:

• Sometimes his gigantic servant wandered about the house at night. - "Tom Swift and his Electric Locomotive or, Two Miles a Minute on the Rails", Victor Appleton.
• And above all, the gigantic bones which they beheld lying around in every direction, gave them a feeling of disgust; it seemed as if an army of animals had taken refuge in this solitary island only to die there. - "The Waif of the "Cynthia"", André Laurie and Jules Verne.
• These gigantic works are the works of despair. - "The Birth-Time of the World and Other Scientific Essays", J. (John) Joly.