crafty (adj.) Look up crafty at Dictionary.com
c.1200, crafti, from Old English cræftig "strong, powerful," later "skillful, ingenious," degenerating by c.1200 to "cunning, sly" (but through 15c. also "skillfully done or made; intelligent, learned; artful, scientific") from craft (n.) + -y (2). Related: Craftily; craftiness.