Verses with the word unsearchable in the Apocrypha (3 verses):

2 Esdras 9:19
For then every one obeyed: but now the manners of them which are created in this world that is made are corrupted by a perpetual seed, and by a law which is unsearchable rid themselves.

Baruch 3:18
For they that wrought in silver, and were so careful, and whose works are unsearchable,

Prayer of Manassheh 1:1
O Lord, Almighty God of our fathers, Abraham, Isaac, and Jacob, and of their righteous seed;