01 a. Unsearchable; incapable of being searched into and understood by inquiry or study; impossible or difficult to be explained or accounted for…
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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.” — Beau. & Fl.“Waiving a question so inscrutable as this.” — De Quincey.