| unconscionable(adjective, expensive, high-priced, pricey, pricely) | |
| uneconomical(adjective, expensive, high-priced, pricey, pricely) | |
| universal(adjective, worldwide, entire) | |
| unlimited | |
| unobtainable(adjective, expensive, high-priced, pricey, pricely) | |
| unreasonable(adjective, expensive, high-priced, pricey, pricely) | |
| upscale(adjective, expensive, high-priced, pricey, pricely) | |
| uranic | |
| usurious(adjective, expensive, high-priced, pricey, pricely) | |
| valuable(adjective, expensive, high-priced, pricey, pricely) | |
| vasty | |
| voluminous | |
| walloping | |
| whacking | |
| zodiacal | |
| abundant(significant, substantial, large) | |
| appreciable(significant, substantial, large) | |
| astrological(adjective, celestial, astral) | |
| astrometry | |
| biggest |
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| APA | Smart Define. (2015). astronomical thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/astronomical/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "astronomical thesaurus" https://smartdefine.org/astronomical/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, astronomical thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/astronomical/thesaurus/synonyms>. |
| MLA | Smart Define. "astronomical thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/astronomical/thesaurus/synonyms> |