cunning

Concise Oxford English Dictionary © 2008 Oxford University Press:
cunning/ˈkʌnɪŋ/

▶adjective

• 1 skilled in achieving one's ends by deceit or evasion.

• 2 clever; ingenious.

• 3 N. Amer. attractive; charming.

▶noun

• 1 craftiness.

• 2 ingenuity.

– derivatives
cunningly adverb,
cunningness noun.

– origin ME (in the sense ‘(possessing) erudition or skill’): perh. from ON kunnandi ‘knowledge’, from kunna ‘know’ (rel. to can1), or perh. from ME cunne, an obs. var. of can1.