'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 every one that heareth these sayings of mine, and doeth them not, shall be likened unto a foolish man, which built his house upon the 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.

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

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 wise, and five were foolish.

They that were foolish took their lamps, and took no oil with them:

And the foolish said unto the wise, Give us of your oil; for our lamps are gone out.