39 entries under adjective topic. ×

32
underground(surface, depth)
14
subterraneous
13
buried(hidden, underground, covered, depth)
12
subterrestrial(surface, hidden, underground, covered)
11
ulterior
8
deep(low, down, far, depth)
6
secret(hidden, underground)
5
subaqueous
5
sunken(hidden, underground, covered)
4
covert(hidden, underground)
4
covered(hidden, underground)
4
underfoot(hidden, underground, covered)
2
hypogeal(surface, underground)
2
hypogean(surface, underground)
2
hypogeous(surface, underground)
2
profound(depth, bottomless)
2
below ground(hidden, underground, covered)
2
cavernous
2
subversive(hidden, underground)
2
under wraps(hidden, underground)
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APASmart Define. (2015). subterranean thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/subterranean/thesaurus/synonyms
ChicagoSmart Define. 2015. "subterranean thesaurus" https://smartdefine.org/subterranean/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, subterranean thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/subterranean/thesaurus/synonyms>.
MLASmart Define. "subterranean thesaurus" 13 April 2015. Web. 23 September 2026. <https://smartdefine.org/subterranean/thesaurus/synonyms>