'Vanity' in the Bible

So am I made to possess months of vanity, and wearisome nights are appointed to me.

I loathe it; I would not live alway: let me alone; for my days are vanity.

For he hath known men of vanity, And He seeth iniquity, And one doth not consider it!

Let not him that is deceived trust in vanity: for vanity shall be his recompence.

They conceive mischief, and bring forth vanity, and their belly prepareth deceit.

And how do ye comfort me with vanity, And in your answers hath been left trespass?

If I have walked with vanity, or if my foot hath hasted to deceit;

Surely God will not hear vanity, neither will the Almighty regard it.

And Job with vanity doth open his mouth, Without knowledge words he multiplieth.