'Empty' in the Bible

But I have used none of these things. And I am not writing these things so that it will be done so in my case; for it would be better for me to die than have any man make my boast an empty one.

So it is with you, if you speak words [in an unknown tongue] that are not intelligible and clear, how will anyone understand what you are saying? You will be talking into the air [wasting your breath]!

And if Christ has not been raised, then our preaching is futile and your faith is empty.

But if Christ has not been raised, your faith [is] empty; you are still in your sins.