'Useless' in the Bible

Do not chase after other gods until your shoes wear out and your throats become dry. But you say, 'It is useless for you to try and stop me because I love those foreign gods and want to pursue them!'

The fiery bellows of judgment burn fiercely. But there is too much dross to be removed. The process of refining them has proved useless. The wicked have not been purged.

Go up to Gilead and get medicinal ointment, you dear poor people of Egypt. But it will prove useless no matter how much medicine you use; there will be no healing for you.