inscrutable - definition and synonyms

adjective 

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/ɪnˈskruːtəb(ə)l/
  1. if someone is inscrutable, it is impossible to understand what they are thinking or feeling from their expression or from what they say

    His face remained inscrutable and unsmiling.

derived words

inscrutability

 

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/ɪnˌskruːtəˈbɪləti/
noun [uncountable]