27 entries under unknown topic. ×

26
covert(adjective, show, secret, private, restricted)
17
concealed(adjective, obscure, secret, hidden)
15
private(adjective, intimate, secret, hidden)
11
underground(adjective, secret, hidden, sly)
10
cryptic(adjective, secret, hidden, concealed)
6
veiled(adjective, secret, private, hidden)
5
occult(noun, adjective, secret, hidden)
4
mystical(adjective, secret, hidden, concealed)
4
shrouded(adjective, secret, hidden, concealed)
4
unrevealed(adjective, secret, hidden, concealed)
3
mystic(adjective, secret, hidden, underground)
2
buried(adjective, secret, hidden, concealed)
2
esoteric(adjective, secret, hidden, underground)
2
mysterious(adjective, quiet, secret, hidden)
2
obscure(adjective, secret, hidden, underground)
2
recondite(adjective, secret, hidden, underground)
2
secluded(adjective, secret, hidden, personal)
2
undisclosed(adjective, secret, hidden, personal)
2
unseen(secret, hidden, underground, concealed)
1
abstruse(secret, hidden, underground, concealed)
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APASmart Define. (2015). clandestine thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/clandestine/thesaurus/synonyms
ChicagoSmart Define. 2015. "clandestine thesaurus" https://smartdefine.org/clandestine/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, clandestine thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/clandestine/thesaurus/synonyms>.
MLASmart Define. "clandestine thesaurus" 13 April 2015. Web. 21 September 2026. <https://smartdefine.org/clandestine/thesaurus/synonyms>