Synonyms|111Antonyms|0|Broader|1Narrower|0Related|6

67 entries under underground topic. ×

5
classified(noun, adjective, sensitive, secret, restricted)
3
close(inside, clandestine, undisclosed, furtive)
3
hush-hush(noun, adjective, secret, restricted, hidden)
3
secret(adjective, sensitive, private, hidden, clandestine)
3
under wraps(noun, expression, adjective, sensitive)
2
arcane(clandestine, undisclosed)
2
clandestine
2
cryptic(close, inside, clandestine, undisclosed)
2
esoteric(clandestine, undisclosed)
2
hidden(clandestine, undisclosed)
2
mysterious(clandestine, undisclosed)
2
occult(clandestine, undisclosed)
2
private(secret, clandestine, undisclosed, confidential)
2
restricted(adjective, secret, private, hidden, clandestine)
2
undisclosed
2
unrevealed(clandestine, undisclosed)
1
backdoor(adjective, close, sensitive, inside, clandestine)
1
backstairs(adjective, close, sensitive, inside, clandestine)
1
camouflaged(close, clandestine, undisclosed, furtive)
1
confidential(adjective, secret, private, restricted, hidden)
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APASmart Define. (2015). top secret thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/top_secret/thesaurus/synonyms
ChicagoSmart Define. 2015. "top secret thesaurus" https://smartdefine.org/top_secret/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, top secret thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/top_secret/thesaurus/synonyms>.
MLASmart Define. "top secret thesaurus" 14 April 2015. Web. 28 September 2026. <https://smartdefine.org/top_secret/thesaurus/synonyms>