inscrutable

 
Pronunciation: /ɪnˈskruːtəb(ə)l/

adjective

  • impossible to understand or interpret: Guy looked blankly inscrutable

Derivatives

inscrutability

Pronunciation: /-ˈbɪlɪti/
noun

inscrutably

adverb

Origin:

late Middle English: from ecclesiastical Latin inscrutabilis, from in- 'not' + scrutari 'to search' (see scrutiny)