And then the flash of intelligence was gone, and O’Brien’s face was as inscrutable as everybody else’s.
His face remained completely inscrutable.
It was curious how that beetle-like type proliferated in the Ministries: little dumpy men, growing stout very early in life, with short legs, swift scuttling movements, and fat inscrutable faces with very small eyes.
It was not easy to preserve inscrutability when you did not know what your face looked like.
There are no more uses of "inscrutable" in the book.
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The computer gave some inscrutable error message I can’t remember.