Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Late Latin
Origin: inscrutabilis, from Latin scrutari 'to search'

inscrutable

adjective
     
in‧scru‧ta‧ble
someone 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 noun [uncountable]

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