inquisitorial UK /ɪnˌkwɪzɪˈtɔːɹiəl/US /ɪnˌkwɪzəˈtɔɹiəl/ adjective3 •Of or pertaining to an inquisition, specifically the Inquisition.To parody the inquisitorial rhetoric of another age, I am not now, nor have I ever been, a boy-lover. — 1980 •In a manner of inquisition or inquisitors. •Describing a trial system in which the prosecutor also acts as judge. formsmore inquisitorial · most inquisitorial