Noah Webster's Dictionary (a.) Unsearchable; incapable of being fathomed or understood by inquiry or study; impossible or difficult to be explained or accounted for satisfactorily; obscure; incomprehensible; as, an inscrutable design or event.

Multi-Version Concordance Inscrutable (2 Occurrences) Romans 11:33 Oh the depth of the riches both of the wisdom and the knowledge of God! How unsearchable are his judgments, and his ways past tracing out! (See RSV) Isaiah 40:28 Have you no knowledge of it? has it not come to your ears? The eternal God, the Lord, the Maker of the ends of the earth, is never feeble or tired; there is no searching out of his wisdom. (See NAS)