cunning
adj
1 crafty and shrewd, esp. in deception; sly
cunning as a fox
2 made with or showing skill or cleverness; ingenious
n
3 craftiness, esp. in deceiving; slyness
4 cleverness, skill, or ingenuity
(Old English cunnende; related to cunnan to know (see can1), cunnian to test, experience, Old Norse kunna to know)
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cunningly adv
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cunningness n