'Fool' in the Bible

But I say to you that every one who becomes angry with his brother shall be answerable to the magistrate; that whoever says to his brother 'Raca,' shall be answerable to the Sanhedrin; and that whoever says, 'You fool!' shall be liable to the Gehenna of Fire.

And every one who hears these my teachings and does not act upon them will be found to resemble a fool who builds his house upon sand.

What I am now saying, I do not say by the Lord's command, but as a fool in his folly might, in this reckless boasting.

If however I should choose to boast, I should not be a fool for so doing, for I should be speaking the truth. But I forbear, lest any one should be led to estimate me more highly than what his own eyes attest, or more highly than what he hears from my lips.