Emily Dickinson Lexicon

vast (-er, -est), adj. [L. vastus, void, immense, extensive.] (webplay: call, differ, empty, force, great, heav'n, labor, large, little, magnitude, manners, men, mighty, plains, root, sounded, space, spirits, subject, through, used, waste).

1. Wide; great; large; immense; enormous.
2. Spacious; extensive; immeasurable; far-reaching.
3. Deep; endless; unfathomable; overwhelming.
4. Severe; extreme; forceful; traumatic; catastrophic.
5. Profound; significant; meaningful; important.