- Definitions|2
- Thesaurus|243
- Abbreviations|0
| underground(adjective, surface, depth) | |
| below | |
| beneath | |
| subterraneous(adjective, depth) | |
| buried(adjective, hidden, underground, covered, depth) | |
| subterrestrial(adjective, surface, hidden, underground, covered) | |
| ulterior | |
| deep(adjective, low, down, far, depth) | |
| secret(adjective, hidden, underground) | |
| submarine(noun, depth) | |
| cave | |
| cavern | |
| clandestine | |
| furtive | |
| subaqueous(adjective, depth) | |
| sunken(adjective, hidden, underground, covered) | |
| covert(adjective, hidden, underground) | |
| covered(adjective, hidden, underground) | |
| underfoot(adjective, hidden, underground, covered) | |
| hidden |
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Subterranean on
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| APA | Smart Define. (2015). subterranean thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/subterranean/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "subterranean thesaurus" https://smartdefine.org/subterranean/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, subterranean thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/subterranean/thesaurus/synonyms>. |
| MLA | Smart Define. "subterranean thesaurus" 13 April 2015. Web. 20 September 2026. <https://smartdefine.org/subterranean/thesaurus/synonyms> |