Synonyms|113Antonyms|36|Broader|3Narrower|0Related|91
2
hypogeal(adjective, surface, underground)
2
hypogean(adjective, surface, underground)
2
hypogeous(adjective, surface, underground)
2
profound(adjective, depth, bottomless)
2
submerged
2
below ground(adjective, hidden, underground, covered)
2
cavernous(adjective, bottomless)
2
grotto
2
subterrene
2
subversive(adjective, hidden, underground)
2
surface
2
under
2
under wraps(adjective, hidden, underground)
2
undercover
2
underneath
1
occult
1
underwater
1
alien
1
aloof
1
backdoor
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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>