cun·ning 
(kŭnĭng)
(kŭnĭng)adj.
1. Marked by or given to artful subtlety and deceptiveness.
2. Executed with or exhibiting ingenuity.
3. Delicately pleasing; pretty or cute: a cunning pet.
n.
1. Skill in deception; guile.
2. Skill or adeptness in execution or performance; dexterity.
[Middle English, present participle of connen, to know, from Old English cunnan; see gnō- in the Appendix of Indo-European roots.]
cunning·ly adv.
cunning·ness n.