'Unproductive' in the Bible

He said, “What are these cities [good for] which you have given me, my brother?” So they have been called the land of Cabul (like nothing, unproductive) to this day.

For if I pray in a tongue, my spirit prays, but my mind is unproductive [because it does not understand what my spirit is praying].

But are you willing to recognize, you foolish [spiritually shallow] person, that faith without [good] works is useless?