Synonyms|460Antonyms|53|Broader|3Narrower|0Related|431

55 entries under underground topic. ×

27
underhand(adjective, mean, bad, smooth, wrong)
10
underhanded(adjective, honest, false, corrupt, dishonest)
8
sneak(adjective, clandestine, undisclosed)
5
backstairs(adjective, clandestine, undisclosed)
3
hidden(adjective, secret, private, clandestine)
2
deep(cunning, sly, crafty, clandestine)
2
private(adjective, secret, hidden, clandestine)
2
under-the-table(secret, private, hidden, clandestine)
1
backdoor(clandestine, undisclosed)
1
camouflaged(clandestine, undisclosed)
1
classified(clandestine, undisclosed)
1
cloak-and-dagger(adjective, full, sly, clandestine)
1
close(clandestine, undisclosed)
1
closet(adjective, sly, clandestine, fraudulent)
1
clouded(shaky, unlikely, clandestine, undisclosed)
1
confidential(clandestine, undisclosed)
1
conspiratorial(adjective, clandestine, undisclosed, covert)
1
cryptic(clandestine, undisclosed)
1
discreet(clandestine, undisclosed)
1
disguised(clandestine, undisclosed, covert, secretive)
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APASmart Define. (2015). sneaky thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/sneaky/thesaurus/synonyms
ChicagoSmart Define. 2015. "sneaky thesaurus" https://smartdefine.org/sneaky/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, sneaky thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/sneaky/thesaurus/synonyms>.
MLASmart Define. "sneaky thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/sneaky/thesaurus/synonyms>