duplicitous

given to or marked by cheating and deception warned her not to trust the duplicitous art dealer Synonyms bent [chiefly British], crooked, deceptive, double-dealing, dishonest, fast, fraudulent, guileful, rogue, shady, sharp, shifty, underhand, underhandedRelated Words unconscionable, unethical, unprincipled, unscrupulous; deceitful, deceiving, deluding, delusive, delusory, false; artful, beguiling, cagey (also cagy), crafty, cunning, foxy, slick, sly, subtle, wily; defrauding, devious, furtive, slippery, sneaking, sneaky, trickish, tricky; insidious, perfidious, treacherousNear Antonyms conscientious, decent, ethical, honorable, just, scrupulous, upright; forthright, straightforwardAntonyms aboveboard, honest, straight