Synonyms|224Antonyms|62|Broader|0Narrower|0Related|264

45 entries under underground topic. ×

5
confidential(adjective, personal, clandestine, hush-hush)
4
classified(obscure, unknown, personal, clandestine)
4
strange(obscure, unknown, clandestine, unrevealed)
3
hush-hush(adjective, personal, clandestine, confidential)
2
arcane(obscure, unknown, clandestine, unrevealed)
2
restricted
2
top-secret
2
top secret(expression, clandestine)
2
under wraps(expression, cover, obscure, dark, equivocal)
2
underhand(adjective, clandestine)
2
unpublished(obscure, unknown, clandestine, unrevealed)
1
ambiguous(cover, obscure, dark, unknown, equivocal)
1
deep(obscure, unknown, clandestine, unrevealed)
1
incognito(unknown, clandestine, nameless)
1
out-of-the-way(obscure, unknown, clandestine, unrevealed)
1
reticent(obscure, unknown, clandestine, unrevealed)
1
retired(obscure, unknown, personal, clandestine)
1
secretive(adjective, clandestine)
1
unacknowledged(unknown, clandestine, nameless)
1
undercover(secret, unknown, hidden, concealed)
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APASmart Define. (2015). undisclosed thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/undisclosed/thesaurus/synonyms
ChicagoSmart Define. 2015. "undisclosed thesaurus" https://smartdefine.org/undisclosed/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, undisclosed thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/undisclosed/thesaurus/synonyms>.
MLASmart Define. "undisclosed thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/undisclosed/thesaurus/synonyms>