All 4 Uses

inscrutable
in
1984, by Orwell
(Auto-generated)

And then the flash of intelligence was gone, and O'Brien's face was as inscrutable as everybody else's.†
p. 17.7 *

inscrutable = impossible to understand
His face remained completely inscrutable.†
p. 36.8
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.†
p. 60.6
It was not easy to preserve inscrutability when you did not know what your face looked like.†
p. 280.9

Definitions:

(1) (inscrutable)
impossible to understand -- often when finding a person's facial expression or comments mysterious
(2) (meaning too rare to warrant focus)