| spacious | |
| spendthrift(adjective, expensive, high-priced, pricey, pricely) | |
| spendy(adjective, expensive, high-priced, pricey, pricely) | |
| spherical(adjective, stellar) | |
| sphery | |
| star-spangled | |
| star-studded | |
| steep(adjective, expensive, high-priced, pricey, pricely) | |
| stellary | |
| stupendous | |
| sumptuous(adjective, expensive, high-priced, pricey, pricely) | |
| super-duper(significant, substantial, large) | |
| superexpensive(adjective, expensive, high-priced, pricey, pricely) | |
| terrestrial | |
| towering | |
| ultraexpensive(adjective, expensive, high-priced, pricey, pricely) | |
| unaffordable(adjective, expensive, high-priced, pricey, pricely) | |
| unapproachable(adjective, expensive, high-priced, pricey, pricely) | |
| unattainable(adjective, expensive, high-priced, pricey, pricely) | |
| unavailable(adjective, expensive, high-priced, pricey, pricely) |
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| APA | Smart Define. (2015). astronomical thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/astronomical/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "astronomical thesaurus" https://smartdefine.org/astronomical/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, astronomical thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/astronomical/thesaurus/synonyms>. |
| MLA | Smart Define. "astronomical thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/astronomical/thesaurus/synonyms> |