'Unused' in the Bible

But if any of the flesh of the offering is still unused on the third day, it is to be burned with fire.

From the blood of the dead, from the fat of the strong, the bow of Jonathan was not turned back, the sword of Saul did not come back unused.

Certainly Ephraim's words of grief have come to my ears, You have given me training and I have undergone it like a young cow unused to the yoke: let me be turned and come back, for you are the Lord my God.