'Foolish' in the Bible

who said by the Holy Spirit through your servant David our forefather, 'Why do the nations rage, and the peoples plot foolish things?

“Men, why are you doing these things? We too are only men of the same nature as you, bringing the good news to you, so that you turn from these useless and meaningless things to the living God, who made the heaven and the earth and the sea and everything that is in them.

Also some of the Epicurean and Stoic philosophers were conversing with him, and some were asking, "What does this foolish babbler want to say?" Others said, "He seems to be a proclaimer of foreign gods." (They said this because he was proclaiming the good news about Jesus and the resurrection.)