'Unsearchable' in the Bible

Behold, God is great, and we don't know him. The number of his years is unsearchable.

Great is Yahweh, and greatly to be praised! His greatness is unsearchable.

As the heavens for height, and the earth for depth, so the hearts of kings are unsearchable.

Haven't you known? Haven't you heard? The everlasting God, Yahweh, The Creator of the ends of the earth, doesn't faint. He isn't weary. His understanding is unsearchable.