'Foolish' in the Bible

You foolish ones, did not He who made the outside make the inside also?

But God said unto him, Thou foolish one, this night is thy soul required of thee; and the things which thou hast prepared, whose shall they be?

Not many days later, the younger son gathered together all he had and traveled to a distant country, where he squandered his estate in foolish living.

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

Then Jesus told them, "O, how foolish you are! How slow you are to believe everything the prophets said!