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From The Collaborative International Dictionary of English v.0.48:
Wily \Wil"y\, a. [Compar. Wilier; superl. Wiliest.] [From Wile.] Full of wiles, tricks, or stratagems; using craft or stratagem to accomplish a purpose; mischievously artful; subtle. "Wily and wise." --Chaucer. "The wily snake." --Milton. [1913 Webster] This false, wily, doubling disposition of mind. --South. [1913 Webster] Syn: Cunning; artful; sly; crafty. See Cunning. [1913 Webster]