WordNet sense 1 (of uncertain outcome; especially fraught with risk):

chancy, dicey, chanceful

WordNet sense 2 (involving or causing danger or risk; liable to hurt or harm):

dangerous, unsafe

WordNet sense 3 (marked by skill in deception):

crafty, cunning, guileful, knavish, slick, sly, tricky, wily, tricksy

WordNet sense 4 (marked by skill in achieving a desired end especially with cunning or craft):

artful