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
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NAmE//ɪnˌskrut̮əˈbɪlət̮i//
noun [uncountable] NAmE//ɪnˈskrut̮əbli//
adverbSee inscrutable in the Oxford Advanced Learner's DictionaryCheck pronunciation: inscrutable