50 entries under underhanded topic. ×

18
secret(adjective, quiet, show, separate, dishonest)
14
covert(adjective, show, secret, hidden, clandestine)
13
clandestine(adjective, show, dishonest, secret, hidden)
12
surreptitious(adjective, dishonest, secret, hidden, sneaky)
10
undercover(adjective, show, dishonest, secret, hidden)
6
concealed(adjective, separate, dishonest, secret, hidden)
6
stealthy(adjective, quiet, dishonest, secret, hidden)
4
furtive(adjective, dishonest, secret, hidden, sneaky)
2
cloaked(secret, hidden, underground, concealed, sneaky)
2
disguised(secret, hidden, clandestine, concealed, sneaky)
2
masked(secret, hidden, concealed, covered)
2
secretive(adjective, quiet, dishonest, cunning, deceitful)
2
ulterior(separate, secret, hidden, underground)
1
buried(separate, secret, hidden, concealed)
1
camouflaged(secret, hidden, clandestine, concealed)
1
crafty(dishonest, cunning, deceitful, sneaky)
1
cunning(dishonest, deceitful, sneaky, covert)
1
dissembled(secret, hidden, clandestine, underground, undisclosed)
1
fraudulent(dishonest, cunning, deceitful, secret, private)
1
guileful(dishonest, cunning, deceitful, sneaky)
<123>
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APASmart Define. (2015). hush-hush thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/hush-hush/thesaurus/synonyms
ChicagoSmart Define. 2015. "hush-hush thesaurus" https://smartdefine.org/hush-hush/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2015, hush-hush thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/hush-hush/thesaurus/synonyms>.
MLASmart Define. "hush-hush thesaurus" 13 April 2015. Web. 30 September 2026. <https://smartdefine.org/hush-hush/thesaurus/synonyms>