'Futility' in the Bible

So I have been made to inherit months of futility,and troubled nights have been assigned to me.

“I waste away and loathe my life; I will not live forever.Let me alone, for my days are but a breath [futile and without substance].

I will be condemned, so why should I wear myself out with this futility?

“Let him not trust in vanity (emptiness, futility) and be led astray;For emptiness will be his reward [for such living].