| sphere | |
| subsoil | |
| sward | |
| terrane | |
| territory | |
| tillage | |
| topsoil | |
| township | |
| turf | |
| under cover(expression, adjective, underground) | |
| hell | |
| on the QT(expression, adjective, idiom, underground) |
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| APA | Smart Define. (2015). sky thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/sky/thesaurus/antonyms |
| Chicago | Smart Define. 2015. "sky thesaurus" https://smartdefine.org/sky/thesaurus/antonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, sky thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/sky/thesaurus/antonyms>. |
| MLA | Smart Define. "sky thesaurus" 11 November 2015. Web. 25 September 2026. <https://smartdefine.org/sky/thesaurus/antonyms> |