'Vanity' in the Bible

So I have been caused to inherit months of vanity, And nights of misery they numbered to me.

I have wasted away -- not to the age do I live. Cease from me, for my days are vanity.

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

Let him not put credence in vanity, He hath been deceived, For vanity is his recompence.

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

If I have walked with vanity, And my foot doth hasten to deceit,

Surely vanity God doth not hear, And the Mighty doth not behold it.

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