'Foolish' in the Bible

And the king made a song of grief for Abner and said, Was the death of Abner to be like the death of a foolish man?

And when the ark of the Lord came into the town of David, Michal, Saul's daughter, looking out of the window, saw King David dancing and jumping before the Lord; and to her mind he seemed foolish.

Then David came back to give a blessing to his family. And Michal, Saul's daughter, came out to him and said, How full of glory was the king of Israel today, who let himself be seen uncovered by his servant-girls like a foolish person uncovering himself without shame!

And word came to David, saying, Ahithophel is among those who are joined to Absalom. And David said, O Lord, let the wisdom of Ahithophel be made foolish.