10
sizable(adjective, great, big, large, grand)
10
spacious(adjective, big, large, grand, huge)
10
substantial(adjective, big, large, grand, huge)
10
thumping(adjective, large, grand, huge, tremendous)
9
copious(adjective, great, big, large, grand)
9
fat(adjective, big, large, grand, huge)
9
hefty(adjective, big, large, grand, huge)
9
lofty(adjective, large, grand, size, over)
9
oversize(adjective, big, large, size, huge)
9
super-duper(adjective, great, big, amazing, large)
8
grandiose(adjective, large, grand, size, over)
8
heavyweight(adjective, big, heavy, important, large)
8
heroic(adjective, great, big, grand, colossal)
8
ponderous(adjective, big, large, grand, huge)
8
strapping(adjective, big, large, grand, huge)
8
thundering(adjective, big, large, grand, huge)
7
Bunyanesque(adjective, big, huge, giant)
7
awesome(adjective, large, grand, size, huge)
7
cosmic(adjective, great, big, grand, huge)
7
cosmical(adjective, big, large, grand, huge)
10 years ago|10k views|share |citing 
APASmart Define. (2016). gargantuan thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/gargantuan/thesaurus/synonyms
ChicagoSmart Define. 2016. "gargantuan thesaurus" https://smartdefine.org/gargantuan/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2016, gargantuan thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/gargantuan/thesaurus/synonyms>.
MLASmart Define. "gargantuan thesaurus" 26 February 2016. Web. 28 September 2026. <https://smartdefine.org/gargantuan/thesaurus/synonyms>