'Fool' in the Bible

Then Saul said, "I have sinned! Come back, David my son, for I will not harm you again, because my life [was] precious in your eyes this day. Look, I have acted like a fool and {have made a terrible mistake}."

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.