63 entries under clandestine topic. ×

5
discreet(adjective, personal, underground, undisclosed)
5
retired(verb, adjective, close, quiet, obscure)
5
sneak(adjective, underground, undisclosed, underhand)
5
unacknowledged(adjective, sensitive, unknown, undisclosed)
4
backstairs(adjective, sensitive, underground, undisclosed)
4
conspiratorial(adjective, hidden, underground, undisclosed)
4
incognito(adjective, unknown, hidden, undisclosed)
4
under-the-table(adjective, sensitive, private, hidden)
3
ambiguous(adjective, obscure, dark, uncertain, mysterious)
3
backdoor(adjective, sensitive, intimate, private, hidden)
3
reticent(adjective, quiet, humble, distant, minor)
3
top secret(expression, adjective, sensitive, private, hidden)
2
sub-rosa(adjective, sensitive, dishonest, cunning, deceitful)
2
top-secret(adjective, underground, undisclosed, classified)
2
unenlightened(adjective, hidden, underground, undisclosed)
2
unfrequented(adjective, close, quiet, mild, shy)
2
unintelligible(adjective, obscure, dark, superior, uncertain)
1
dissembled(adjective, hidden, underground, undisclosed)
1
dissimulated(adjective, underground, undisclosed, underhand)
1
enigmatical(adjective, strange, supernatural, hidden, spiritual)
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APASmart Define. (2016). secret thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/secret/thesaurus/synonyms
ChicagoSmart Define. 2016. "secret thesaurus" https://smartdefine.org/secret/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2016, secret thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/secret/thesaurus/synonyms>.
MLASmart Define. "secret thesaurus" 31 March 2016. Web. 28 September 2026. <https://smartdefine.org/secret/thesaurus/synonyms>