in·scru·ta·ble /ɪnˈskruːtəbəl/ adjectiveadjEXPRESSION 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 〔因面無表情而〕難以理解的,莫測高深的He stood silent and inscrutable. 他靜靜地站着,讓人難以捉摸。
—inscrutably adverbadv
—inscrutability /ɪnˌskruːtəˈbɪləti/ noun [uncountableU]