'Profitable' in the Bible

Then I went to the Euphrates, and digged, and took the girdle from the place where I had hid it; and, behold, the girdle was marred, it was profitable for nothing.

This evil people, that refuse to hear my words, that 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 girdle, which is profitable for nothing.