9
expansive(adjective, space, large)
9
roomy(adjective, great, space, large, huge)
9
towering(adjective, strong, large, huge, greatness)
8
interminable(adjective, complete, absolute, huge, indefinite)
8
mighty(adjective, big, size, huge, hidden)
8
monster(noun, adjective, big, amazing, size)
8
whopping(adjective, great, slang, big, large)
8
astronomical(adjective, large, huge, expensive, high-priced)
7
bulky(adjective, strong, great, big, powerful)
7
cavernous(adjective, large, hollow)
7
grand(adjective, strong, great, big, powerful)
7
mountainous(adjective, great, big, large, huge)
7
sizable(adjective, open, great, big, large)
7
comprehensive(adjective, great, large, thick, huge)
7
inexhaustible(adjective, absolute, endless, immense, infinite)
7
widespread(adjective, open, big, space, large)
6
commodious(adjective, open, large, huge, extensive)
6
cosmic(adjective, universal, limitless)
6
grandiose(adjective, great, big, large, extravagant)
6
illimitable(adjective, complete, large, huge, unrestrained)
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APASmart Define. (2015). vast thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/vast/thesaurus/synonyms
ChicagoSmart Define. 2015. "vast thesaurus" https://smartdefine.org/vast/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, vast thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/vast/thesaurus/synonyms>.
MLASmart Define. "vast thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/vast/thesaurus/synonyms>