'Vain' in the Bible

Then David returned to bless his household. And Michal the daughter of Saul came out to meet David, and said, How glorious was the king of Israel to day, who uncovered himself to day in the eyes of the handmaids of his servants, as one of the vain fellows shamelessly uncovereth himself!

or I had done against my soul a vain thing, and no matter is hid from the king, and thou -- thou dost station thyself over-against.'