'Futility' in the Bible

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

So he made their days end in futility, and their years with sudden terror.

"I said: "I've labored for nothing. I've exhausted my strength on futility and on emptiness.' Yet surely my recompense is with the LORD, and my reward is with my God.

They hatch adders' eggs and weave a spider's web; whoever eats their eggs dies, and any crushed egg hatches out futility.