27 entries under sly topic. ×

34
cunning(adjective, sneaky, guile, insidiousness)
31
deceitful(adjective, dishonest, cunning, guile)
27
wily(adjective, crafty, cunning, sneaky)
26
treacherous(adjective, dishonest, tricky, disloyal)
26
tricky(adjective, cunning, guile, insidiousness)
26
crafty(adjective, cunning, sneaky, guile)
23
artful(adjective, cunning, sneaky, guile)
20
subtle(adjective, cunning, guile, insidiousness, characteristic)
17
dishonest(adjective, characteristic, tricky, sneaky, guile)
15
foxy(adjective, shrewd, sneaky, tricky, characteristic)
14
sneaky(adjective, characteristic, informal, guile, insidiousness)
13
deceptive(adjective, dishonest, guile, insidiousness, characteristic)
13
shifty(adjective, smooth, false, dishonest, deceitful)
10
smooth(adjective, guile, insidiousness, characteristic, mean)
9
astute(adjective, cunning, characteristic, smooth, sharp)
9
deep(adjective, devious, cunning, characteristic, smooth)
9
scheming(adjective, dishonest, deceitful, shrewd)
8
arch(cunning, adjective, characteristic, mean, smooth)
7
snaky(adjective, characteristic, tricky, devious)
6
calculating(adjective, dishonest, deceitful, crafty)
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APASmart Define. (2015). insidious thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/insidious/thesaurus/synonyms
ChicagoSmart Define. 2015. "insidious thesaurus" https://smartdefine.org/insidious/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, insidious thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/insidious/thesaurus/synonyms>.
MLASmart Define. "insidious thesaurus" 14 April 2015. Web. 26 September 2026. <https://smartdefine.org/insidious/thesaurus/synonyms>