'Foolish' in the Bible

O you foolish ones! did not he who made the outside in the same way make the inside?

But God said to him, You foolish one, tonight I will take your soul from you, and who then will be the owner of all the things which you have got together?

And not long after, the younger son got together everything which was his and took a journey into a far-away country, and there all his money went in foolish living.

But these words seemed foolish to them, and they had no belief in them.

And he said, O foolish men! how slow you are to give belief to what the prophets have said.