Insidious


Synonyms for insidious
adj sneaky, tricky

subtle
dangerous
Machiavellian
artful
astute
corrupt
crafty
crooked
cunning

deceitful
deceptive
deep
designing
dishonest
disingenuous
duplicitous
foxy
intriguing

perfidious
perilous
secret
slick
sly
smooth
snaky
stealthy
surreptitious

treacherous
wily
wormlike
guileful
sneaking
false
ensnaring
like a snake in the grass

Antonyms for insidious

honest
sincere

fair
open

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