The empty, vast, and wandering air. --Shak.
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.
Through the vast and boundless deep. --Milton.
3. Very great in numbers, quantity, or amount; as, a vast
army; a vast sum of money.
4. Very great in importance; as, a subject of vast concern.
Syn: Enormous; huge; immense; mighty.