adjective

having or showing skill in achieving one’s ends by deceit or evasion.

a cunning look came into his eyes

crafty,wily,artful,guileful,devious,sly,knowing,scheming,designing,tricky,slippery,slick,manipulative,Machiavellian,deceitful,deceptive,duplicitous,Janus-faced,shrewd,astute,clever,canny,sharp,sharp-witted,skilful,ingenious,resourceful,inventive,imaginative,deft,adroit,dexterous,foxy,savvy,fiendish,sneaky,fly,pawky,slim,subtle,vulpine,carny