In*scru"ta*ble (?), a. [L. inscrutabilis : cf. F. inscrutable. See In- not, and Scrutiny.] Unsearchable; incapable of being searched into and understood by inquiry or study; impossible or difficult to be explained or accounted for satisfactorily; obscure; incomprehensible; as, an inscrutable design or event.

'T is not in man
To yield a reason for the will of Heaven
Which is inscrutable.

Waiving a question so inscrutable as this.

• difficult or impossible to comprehend, fathom or interpret; ineffable
        His inscrutable theories would years later become the foundation of a whole new science.
        The inscrutability of all this was the kind of inscrutability you have when you suddenly enter a room where a furious argument has just ended. Everyone is quiet. No one is talking. -- Robert Persig, Zen and the Art of Motorcycle Maintenance