'Profitable' in the Bible

Then I went to the Euphrates, and dug, and took the belt from the place where I had hidden it; and behold, the belt was marred, it was profitable for nothing.

This evil people, who refuse to hear my words, who walk in the stubbornness of their heart, and are gone after other gods to serve them, and to worship them, shall even be as this belt, which is profitable for nothing.