What is another word for 'insidious'?

Synonyms for INSIDIOUS: subtle, pernicious, pestilent, elusive, baneful, deadly, wily, treacherous, designing, dangerous, deceitful, sly, crafty, artful, arch, cunning, intriguing, crooked, trickish, TRICKY, foxy, snaky, diplomatic, machiavelian, underhand, sinister, scheming, pervasive, sneaky, devious, etc.

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