Definition of inscrutable adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ɪnˈskruːtəbl//
; NAmE NAmE//ɪnˈskruːtəbl//
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if a person or their expression is inscrutable, it is hard to know what they are thinking or feeling, because they do not show any emotion He was wearing that inscrutable look again. Her face had become inscrutable. Word Originlate Middle English: from ecclesiastical Latin inscrutabilis, from in- ‘not’ + scrutari ‘to search’ (originally ‘sort rubbish’, from scruta ‘rubbish’).
See the Oxford Advanced American Dictionary entry: inscrutable