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Definition of vast:

  1. A waste region; boundless space; immensity.
  2. Of great extent; very spacious or large; also, huge in bulk; immense; enormous; as, the vast ocean; vast mountains; the vast empire of Russia.
  3. Very great in importance; as, a subject of vast concern.
  4. Very great in numbers, quantity, or amount; as, a vast army; a vast sum of money.
  5. Waste; desert; desolate; lonely.


widespread, broad, Bunyanesque, detailed, far-flung, pythonic, mighty, jumbo, stupendous, abundant, whopping, commodious, astronomical, mountainous, long, titanic, wide, Cyclopean, monstrous, coarse, gigantesque, considerable, mastodonic, far-reaching, walloping, prolonged, behemoth, limited, monumental, narrow, massy, all-inclusive, Herculean, monster, heroic, Brobdingnagian.

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