'Vain' in the Bible

Who by the mouth of thy servant David hast said, Why did the heathen rage, and the people imagine vain things?

And Saul said, “Who are You, Lord?” And He answered, “I am Jesus whom you are persecuting,

and saying, “Men, why are you doing these things? We are also men of the same nature as you, and preach the gospel to you that you should turn from these vain things to a living God, who made the heaven and the earth and the sea and all that is in them.

And when we all had fallen to the ground, I heard a voice in the Hebrew dialect (Jewish Aramaic) saying to me, ‘Saul, Saul, why are you persecuting Me? It is hard for you to kick [repeatedly] against the goads [offering pointless resistance].’

When daylight came, they tried in vain to recognise the coast. But an inlet with a sandy beach attracted their attention, and now their object was, if possible, to run the ship aground in this inlet.