'Fool' in the Bible

Now consider carefully what you must do, because there is certain to be trouble for our master and his entire family. He is such a worthless fool nobody can talk to him!”

My lord should not pay attention to this wicked man Nabal. He simply lives up to his name! His name means 'fool,' and he is indeed foolish! But I, your servant, did not see the servants my lord sent.

Then said Saul, I have sinned: return, my son David: for I will no more do thee harm, because my soul was precious in thine eyes this day: behold, I have played the fool, and have erred exceedingly.

Then Saul said to {his armor bearer}, "Draw your sword and thrust me through with it, so that these uncircumcised do not come and thrust me through and make a fool of me!" But {his armor bearer} [was] not willing [to do so] because he [was] very afraid. So Saul took the sword and fell on it.