The Oxford Thesaurus An A-Z Dictionary of Synonyms - serpentineadj.

1) evil, bad, diabolical, satanic, Mephistophelian, reptilian, devilish, wily, cunning, conniving, sneaky, shrewd, artful, crafty, slick, sly, insidious, shifty, tricky, scheming, plotting, Machiavellian: With serpentine deceit she swore that she had returned the ring. 2) twisting, winding, tortuous, snaking, snakelike, sinuous, anfractuous, roundabout, meandering, ambagious, indirect, devious, crooked, labyrinthine, vermicular, vermiculate, complex, complicated, Byzantine: The amulet was traced through a serpentine trail of ownership back to Xerxes.