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;
'T is not in man
To yield a reason for the will of Heaven
Which is inscrutable. Beau. & Fl. [ 1913 Webster ]
Waiving a question so inscrutable as this. De Quincey. [ 1913 Webster ]
n. The quality or state of being inscrutable; inscrutability. [ 1913 Webster ]