The inscrutableness of the ancient manuscript frustrated every scholar who attempted to decode its symbols.

Her inscrutable expression made it impossible to tell what she was thinking.

The inscrutable took a seat at the head of the table, and everyone fell silent.

The old sailor swore he had seen inscrutables drifting in the fog, their silent eyes reflecting no hint of human feeling.

She stared inscrutably at the old map, as if trying to recall a secret only it could reveal.

Her inscrutability made it difficult for colleagues to read her intentions.