66
immense(adjective, strong, open, great, spread)
59
enormous(adjective, big, large, size, expensive)
49
huge(adjective, big, large, size, expensive)
37
great(adjective, strong, big, powerful, amazing)
34
large(adjective, great, big, large, abundant)
32
gigantic(adjective, great, big, large, size)
31
tremendous(adjective, strong, great, big, powerful)
30
massive(adjective, great, big, large, huge)
28
gargantuan(adjective, big, large)
26
prodigious(adjective, big, large, size, expensive)
26
colossal(adjective, great, big, large, size)
24
mammoth(adjective, great, big, large, size)
24
big(adjective, great, large, huge, immense)
22
titanic(adjective, great, big, large, size)
20
extensive(adjective, great, space, large, huge)
19
stupendous(adjective, great, big, wonderful, amazing)
19
giant(adjective, great, big, large, size)
19
immeasurable(adjective, great, big, large, fat)
17
boundless(adjective, limit, space, large, huge)
17
Brobdingnagian(adjective, big, huge, immense, monstrous)
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APASmart Define. (2015). vast thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/vast/thesaurus/synonyms
ChicagoSmart Define. 2015. "vast thesaurus" https://smartdefine.org/vast/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, vast thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/vast/thesaurus/synonyms>.
MLASmart Define. "vast thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/vast/thesaurus/synonyms>