devil's advocate noun 2verb 1forms 3 noun2 •One who debates from a viewpoint which one may not actually hold, usually to determine its validity or simply for the sake of argument.I don't really believe all that – I was just playing devil's advocate. •(historical) A canon lawyer appointed by the Church to argue against the canonization of the proposed candidate. verb1 •(informal) To play devil's advocate. formsdevil's advocated · devil's advocating · devil's advocates