44 entries under underhanded topic. ×

32
secret(adjective, separate, evil, obscure, dark)
26
covert(adjective, show, obscure, dark, strange)
17
private(adjective, individual, secret, isolated, hidden)
12
clandestine(adjective, dishonest, cunning, secret, unknown)
9
surreptitious(adjective, dishonest, cunning, secret, hidden)
7
hush-hush(adjective, separate, dishonest, secret, hidden)
6
incognito(adjective, strange, disguise, secret, hidden)
6
stealthy(adjective, dishonest, cunning, secret, hidden)
5
undercover(adjective, obscure, dishonest, cunning, secret)
4
furtive(adjective, strange, dishonest, cunning, secret)
3
sneaking(dishonest, cunning, deceitful, sneaky)
3
sneaky(adjective, dishonest, cunning, deceitful)
2
indirect(obscure, dishonest, cunning, deceitful)
2
under wraps(expression, adjective, dishonest, secret, hidden)
1
crooked(dishonest, cunning, deceitful, sneaky)
1
deceptive(adjective, dishonest, cunning, deceitful, crooked)
1
dishonest(adjective, cunning, deceitful, crooked, sly)
1
fraudulent(dishonest, cunning, deceitful, hidden, sneaky)
1
shifty(adjective, dishonest, cunning, deceitful, crooked)
1
sly(adjective, dishonest, cunning, deceitful, sneaky)
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APASmart Define. (2015). concealed thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/concealed/thesaurus/synonyms
ChicagoSmart Define. 2015. "concealed thesaurus" https://smartdefine.org/concealed/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, concealed thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/concealed/thesaurus/synonyms>.
MLASmart Define. "concealed thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/concealed/thesaurus/synonyms>