Pocket Thesaurus
Synonyms of insidious
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
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