wily(adjective) adjective1. marked by skill in deception- a wily old attorneySimilar word(s): artful, crafty, cunning, dodgy, foxy, guileful, knavish, slick, sly, tricksy, trickySentences with wily as an adjective:- Horatio's new girlfriend is a wily coquette and poor Horatio is too smitten to see it.