'Worthless' in the Bible

The sons of Eli [Hophni and Phinehas] were worthless (dishonorable, unprincipled) men; they did not know [nor respect] the Lord

But some worthless men said, “How can this man save and rescue us?” And they regarded Saul with contempt and did not bring him a gift. But he ignored the insult and kept silent.

You must not turn away, for then you would go after futile things which cannot profit or rescue, because they are futile.

Saul and the people spared Agag and the best of the sheep, the oxen, the fatlings, the lambs, and everything that was good, and they were not willing to destroy them entirely; but everything that was undesirable or worthless they destroyed completely.