Synonyms|1kAntonyms|189|Broader|12Narrower|16Related|1k

59 entries under underground topic. ×

2
sneak(verb, clandestine, undisclosed)
2
top-secret(clandestine, undisclosed)
2
top secret(expression, clandestine, undisclosed)
2
unacknowledged(clandestine, undisclosed)
2
under wraps(expression, secret, sneaky, covered)
2
unfrequented(adjective, close, quiet, separate, obscure)
1
conspiratorial(adjective, clandestine, undisclosed, sneaky)
1
on the QT(expression, idiom, secret, private)
1
sly(adjective, secret, private, clandestine)
1
strange(new, remote, mysterious, indefinite, clandestine)
1
sub-rosa(secret, private, spy, clandestine)
1
underhanded(secret, clandestine, undisclosed, sneaky)
0
backdoor(clandestine, undisclosed)
0
dissembled(secret, clandestine, undisclosed, underhanded)
0
dissimulated(clandestine, undisclosed)
0
in ambush(expression, clandestine, undisclosed)
0
subterrestrial
0
under false pretense(expression, idiom, clandestine, undisclosed)
0
unenlightened(clandestine, undisclosed)
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ChicagoSmart Define. 2015. "hidden thesaurus" https://smartdefine.org/hidden/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, hidden thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/hidden/thesaurus/synonyms>.
MLASmart Define. "hidden thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/hidden/thesaurus/synonyms>