| hefty(great, big, significant, large, grand) | |
| high(adjective, expensive, high-priced, pricey, pricely) | |
| inestimable | |
| leviathan | |
| marvelous(great, amazing, greatness, astonishing, fabulous) | |
| outrageous(adjective, expensive, greatness, high-priced, pricey) | |
| outsize | |
| sizeable | |
| sweeping(adjective, great, spread, big, large) | |
| terrific(adjective, great, amazing, astonishing, fabulous) | |
| undefined(adjective, immense, infinite, boundless, unlimited) | |
| unending(adjective, complete, deep, endless, immense) | |
| unfathomed(adjective, deep, wide) | |
| unrestricted(adjective, complete, big, large, grand) | |
| whacking | |
| unconscionable(adjective, expensive, greatness, high-priced, pricey) | |
| abundant(great, big, significant, large, huge) | |
| amplitudinous | |
| astonishing(amazing, greatness, astounding) | |
| detailed(adjective, large, wide) |
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| APA | Smart Define. (2015). vast thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/vast/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "vast thesaurus" https://smartdefine.org/vast/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, vast thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/vast/thesaurus/synonyms>. |
| MLA | Smart Define. "vast thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/vast/thesaurus/synonyms> |