68 entries under underground topic. ×

2
furtive(close, clandestine, undisclosed)
2
stealthy(clandestine, undisclosed)
2
surreptitious(clandestine, undisclosed)
2
undercover(clandestine, undisclosed)
1
backdoor(close, sensitive, inside, clandestine)
1
camouflaged(close, clandestine, undisclosed, furtive)
1
clandestine
1
classified(sensitive, clandestine, undisclosed, sub-rosa)
1
close(inside, clandestine, undisclosed, furtive)
1
confidential(restricted, clandestine, discreet, undisclosed)
1
covert(clandestine, undisclosed)
1
cryptic(close, inside, clandestine, undisclosed)
1
discreet(close, restricted, inside, clandestine)
1
disguised(clandestine, undisclosed)
1
dissembled(close, restricted, clandestine, discreet)
1
dissimulated(close, restricted, inside, clandestine)
1
hush-hush(clandestine, undisclosed)
1
incognito(close, restricted, clandestine, discreet)
1
inside(close, restricted, clandestine, discreet)
1
restricted(clandestine, discreet, undisclosed)
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APASmart Define. (2015). in ambush thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/in_ambush/thesaurus/synonyms
ChicagoSmart Define. 2015. "in ambush thesaurus" https://smartdefine.org/in_ambush/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, in ambush thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/in_ambush/thesaurus/synonyms>.
MLASmart Define. "in ambush thesaurus" 14 April 2015. Web. 28 September 2026. <https://smartdefine.org/in_ambush/thesaurus/synonyms>