inscrutable

His inscrutable theories would years later become the foundation of a whole new science.

The pale, inscrutable determinateness, and flinchless intrepidity of Pierre, now began to domineer upon them; for any social unusualness or greatness is sometimes most impressive in the retrospect.

It was unconscious, this smile was, though just after he had said something it got intensified for an instant. It came at the end of his speeches like a seal applied on the words to make the meaning o

She looked at him with an inscrutable expression.

Chinese people are so inscrutable.

The symbols on the clay tablets that we found more than a month ago continue to be as inscrutable and mysterious as when we uncovered them.