Synonyms|196Antonyms|18|Broader|2Narrower|0Related|63

61 entries under underground topic. ×

7
clandestine(adjective, undisclosed)
7
surreptitious(adjective, clandestine, undisclosed)
6
secret(adjective, sensitive, clandestine, undisclosed)
6
stealthy(adjective, clandestine, undisclosed)
6
underhand(adjective, clandestine, undisclosed)
5
sneaky(adjective, clandestine, undisclosed)
5
underhanded(adjective, clandestine, undisclosed)
4
sly(adjective, clandestine, undisclosed)
3
backdoor(close, sensitive, inside, clandestine)
3
hidden(unknowing, clandestine, undisclosed, hermetical)
2
confidential(adjective, restricted, clandestine, discreet)
2
hush-hush(clandestine, undisclosed)
2
occult(clandestine, undisclosed)
2
under-the-table(sensitive, unknowing, clandestine, undisclosed)
1
arcane(adjective, clandestine, undisclosed)
1
camouflaged(close, clandestine, undisclosed, furtive)
1
classified(sensitive, clandestine, undisclosed, sub-rosa)
1
closet(adjective, clandestine, undisclosed)
1
discreet(close, restricted, inside, clandestine)
1
disguised(clandestine, undisclosed)
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APASmart Define. (2015). backstairs thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/backstairs/thesaurus/synonyms
ChicagoSmart Define. 2015. "backstairs thesaurus" https://smartdefine.org/backstairs/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, backstairs thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/backstairs/thesaurus/synonyms>.
MLASmart Define. "backstairs thesaurus" 13 April 2015. Web. 23 September 2026. <https://smartdefine.org/backstairs/thesaurus/synonyms>