'Empty' in the Bible

But I, for my part, have not used, and do not use, my full rights in any of these things. Nor do I now write with that object so far as I myself am concerned, for I would rather die than have anybody make this boast of mine an empty one.

Let no one deceive you with empty words, for it is on account of these very sins that God's anger is coming upon the disobedient.

From these some have drifted away, and have wandered into empty words.