1154, wil "wile, trick," perhaps from O.N.Fr. *wile (O.Fr. guile), or directly from a Scand. source (cf. O.N. vel "trick, craft, fraud," vela "defraud"). Perhaps ultimately related to O.E. wicca "wizard" (see
Wicca). Lighter sense of "amorous or playful trick" is from 1600.