74 entries under adjective topic. ×

6
canny(mean, smooth, sharp, cunning)
6
clever(sensitive, intelligent, cunning, deceitful)
6
perilous(characteristic, tricky, sneaky, guile)
6
sinister(characteristic, guile, insidiousness)
6
two-faced(false, dishonest, cunning, deceitful)
5
secret(sneaky, characteristic, mean, smooth)
5
sharp(mean, smooth, cunning, deceitful)
5
unscrupulous(mean, smooth, dishonest, cunning)
4
deceiving(characteristic, deception, false, deceit)
4
delusive(characteristic, mean, smooth, deception)
4
delusory(characteristic, deception, false, deceit)
4
dishonorable(characteristic, mean, smooth, dishonest)
4
fallacious(characteristic, false, deceit, delusion)
4
hypocritical(characteristic, deceit, delusion)
4
illusive(characteristic, deception, false, deceit)
4
illusory(characteristic, mean, smooth, deception)
4
mischievous(mean, smooth, wicked, cunning)
4
plotting(mean, smooth, cunning, knowing)
4
serpentine(false, misleading, illusory)
4
shady(dishonest, cunning, deceitful, dubious)
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APASmart Define. (2015). insidious thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/insidious/thesaurus/synonyms
ChicagoSmart Define. 2015. "insidious thesaurus" https://smartdefine.org/insidious/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, insidious thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/insidious/thesaurus/synonyms>.
MLASmart Define. "insidious thesaurus" 14 April 2015. Web. 27 September 2026. <https://smartdefine.org/insidious/thesaurus/synonyms>