| eye-opening(adjective, awful, amazing, astonishing, awesome) | |
| far-flung(adjective, big, large, grand, huge) | |
| heroic(adjective, big) | |
| impressive(adjective, large) | |
| indeterminate | |
| overgrown | |
| staggering(adjective, amazing, astonishing, hidden, astounding) | |
| strong(powerful, significant, large, forceful, considerable) | |
| unfathomable(adjective, complete, deep, immense, infinite) | |
| walloping(adjective, informal, big) | |
| weighty(adjective, significant, large, considerable) | |
| abysmal(adjective, extent, immeasurable) | |
| astronomic | |
| behemoth(adjective, big) | |
| bottomless(adjective, deep, immense, infinite, unlimited) | |
| eternal(adjective, deep, large, absolute, huge) | |
| galactic | |
| gaping(adjective, deep, huge, wide, spacious) | |
| generous(adjective, open, great, big, significant) | |
| goodly(great, big, significant, large, huge) |
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| APA | Smart Define. (2015). vast thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/vast/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "vast thesaurus" https://smartdefine.org/vast/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, vast thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/vast/thesaurus/synonyms>. |
| MLA | Smart Define. "vast thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/vast/thesaurus/synonyms> |