inscrutable

his impenetrable eyes and inscrutable countenance give little away.

“It is not for me to attempt to fathom the inscrutable workings of Providence” (Earl of Birkenhead).

the occult sciences. Something that isinscrutable cannot be fathomed by means of investigation or scrutiny:

His inscrutable expression made it difficult to tell what he was thinking.

The inscrutable smile on her face hinted at a hidden agenda.

The inscrutable businessman kept his cards close to his chest during negotiations.

Her inscrutable behavior left her friends puzzled.

The inscrutable nature of the ancient artifact intrigued archaeologists.

The inscrutable man at the party seemed to be observing everyone silently.

The inscrutable decision-making process of the committee baffled the members.

Her inscrutable gaze made him feel uneasy.

The inscrutable plot of the movie kept the audience guessing until the end.

The inscrutable professor rarely shared his thoughts with his students.