mys·ti·fy / ˈmistəˌfī/ • v. (-fies, -fied) [tr.] utterly bewilder or perplex (someone): maladies that have mystified and alarmed researchers for over a decade| [as adj.] (mystifying) a mystifying phenomenon. ∎ dated take advantage of the credulity of; hoax: he took a childlike delight in mystifying his officials. ∎ make obscure or mysterious: lawyers who mystify the legal system so that laymen find it unintelligible.DERIVATIVES: mys·ti·fi·ca·tion / ˌmistəfiˈkāshən/ n.mys·ti·fi·er n.mys·ti·fy·ing·ly adv.