From Longman Dictionary of Contemporary Englishinscrutablein‧scru‧ta‧ble /ɪnˈskruːtəbəl/ adjective EXPRESSION ON somebody'S FACEsomeone who is inscrutable shows no emotion or reaction in the expression on their face so that it is impossible to know what they are feeling or thinking He stood silent and inscrutable. —inscrutably adverb —inscrutability /ɪnˌskruːtəˈbɪləti/ noun [uncountable]
Examples from the Corpus
inscrutable• She looked for some response, but Jean's expression remained inscrutable.• He handled the questions with the inscrutable face of a diplomat.• The inscrutable gaze of the palace guards made me a little nervous.Origin inscrutable (1500-1600) Late Latin inscrutabilis, from Latin scrutari “to search” 