'Foolish' in the Bible

Everyone who hears these words of mine and does not do them is like a foolish man who built his house on sand.

Jesus said, "Even after all this, are you still so foolish?

Five of the virgins were foolish, and five were wise.

When the foolish ones took their lamps, they did not take extra olive oil with them.

The foolish ones said to the wise, 'Give us some of your oil, because our lamps are going out.'