'Foolish' in the Bible

But I say to you that everyone who is angry with his brother will be in danger of being judged; and he who says to his brother, Raca, will be in danger from the Sanhedrin; and whoever says, You foolish one, will be in danger of the hell of fire.

And everyone to whom my words come and who does them not, will be like a foolish man who made his house on sand;

And I say to you that in the day when they are judged, men will have to give an account of every foolish word they have said.

And Jesus, answering, said, O false and foolish generation, how long will I be with you? how long will I put up with you? let him come here to me.

You foolish ones and blind: which is greater, the gold, or the Temple which makes the gold holy?

And five of them were foolish, and five were wise.

For the foolish, when they took their lights, took no oil with them.

And the foolish said to the wise, Give us of your oil; for our lights are going out.