vast

UK: /ˈvɑːst/ US: /væst/ ,(vast, väst)

Inflections of 'vast' (adj):

vaster

adj comparative

vastest

adj superlative

WordReference Random House Learner's Dictionary of American English © 2026

vast /væst/   adj., -er, -est. 

1. of very great area or size:
   a vast continent.
2. very great in quantity or amount:
   the Pharaoh's vast wealth.

vast•ly, adv. 
vast•ness, n. 

[uncountable] the sheer vastness of space.

WordReference Random House Unabridged Dictionary of American English © 2026

vast  (vast, väst), adj., -er, -est, n. 
adj. 

1. of very great area or extent;
   immense:
   the vast reaches of outer space.
2. of very great size or proportions;
   huge;
   enormous:
   vast piles of rubble left in the wake of the war.
3. very great in number, quantity, amount, etc.:
   vast sums of money.
4. very great in degree, intensity, etc.:
   an artisan of vast skill.

n. 
5. [Literary.] an immense or boundless expanse or space.
• Latin vastus empty, immense
• 1565–75
vast′ly, adv. 
vast′ness, n. 
Synonyms
• 1. measureless, boundless, gigantic, colossal, stupendous.
Antonyms
• 1. small.

Collins Concise English Dictionary © HarperCollins Publishers::

vast / vɑːst/ adjective

1. unusually large in size, extent, degree, or number; immense
2. (prenominal) (intensifier): in vast haste

noun

1. the vast ⇒ immense or boundless space

Etymology: 16th Century: from Latin vastus deserted

ˈvastly adverb

ˈvastness noun