50 entries under secret topic. ×

25
furtive(adjective, mean, smooth, smart, dishonest)
22
dishonest(adjective, mean, bad, smooth, wrong)
21
sneaky(adjective, mean, bad, smooth, wrong)
18
clandestine(adjective, deceitful, sly, sneaky)
16
surreptitious(adjective, dishonest, deceitful, sly)
13
stealthy(adjective, quiet, dishonest, cunning, deceitful)
13
underhanded(adjective, honest, false, dishonest, cunning)
11
covert(adjective, mean, hidden, sly)
10
fraudulent(adjective, false, corrupt, dishonest, cunning)
9
secretive(adjective, deceitful, concealment, sneaky)
8
undercover(adjective, deceitful, hidden, spy)
6
concealed(adjective, dishonest, cunning, deceitful)
6
hidden(adjective, cunning, private, clandestine)
6
skulking(adjective, private, hidden, concealment)
6
sneaking(adjective, mean, smooth, smart, false)
6
underground(hidden, spy, clandestine, fraudulent)
5
close(adjective, concealment, sneaky, stealthy)
5
private(adjective, hidden, clandestine, fraudulent)
5
reticent(adjective, concealment, sneaky, stealthy)
4
reserved(adjective, concealment, sneaky, stealthy)
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APASmart Define. (2015). underhand thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/underhand/thesaurus/synonyms
ChicagoSmart Define. 2015. "underhand thesaurus" https://smartdefine.org/underhand/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, underhand thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/underhand/thesaurus/synonyms>.
MLASmart Define. "underhand thesaurus" 13 April 2015. Web. 26 September 2026. <https://smartdefine.org/underhand/thesaurus/synonyms>