mad·man [madmanmadmen] BrE [ˈmædmən] NAmE [ˈmædmən] noun (pl. mad·menBrE [ˈmædmən] ; NAmE [ˈmædmən] ) a man who has a serious mental illness •The killing was the act of a madman. •He drove like a madman. •Some madman (= stupid person) deleted all the files. see also ↑madwoman