Atlantean, Brobdingnagian, Cyclopean, Gargantuan, Herculean, Homeric, abyssal, appalling, astronomic, awful, bottomless, cavernous, colossal, deep as hell, dreadful, elephantine, enormous, epic, fathomless, gaping, giant, giantlike, gigantic, heroic, huge, illimitable, immense, infinite, jumbo, mammoth, mighty, monster, monstrous, monumental, mountainous, plumbless, plunging, prodigious, profound, soundless, stupendous, terrible, titanic, towering, tremendous, unfathomable, unfathomed, unsounded, vast, without bottom, yawning