VAST

adj. infinite, unlimited, boundless, limitless, unbounded, interminable, endless, never-ending, inexhaustible, indeterminate, immeasurable, incalculable, measureless; immense, enormous, huge, tremendous, great, prodigious, stupendous, gigantic, massive, voluminous, capacious, colossal, monumental, mammoth, jumbo, elephantine, behemoth, Cyclopean, Brobdingnagian, titanic, Literary vasty, Colloq ginormous, humongous It is difficult to comprehend the vast distances of space There is a vast difference between the climates of California and the Midwest.