1 : characterized by errors; not agreeing with a model or not following established rules; "he submitted a faulty report"; "an incorrect transcription"; "the wrong side of the road"
2 : wrong in e.g. opinion or judgment; "well-meaning but misguided teachers"; "a mistaken belief"; "mistaken identity"
3 : used of the side of cloth or clothing intended to face inward; "socks worn wrong side out"