'Foolishly' in the Bible

Then Samuel told Saul, "You have acted foolishly. You haven't obeyed the commandment of the LORD your God, which he commanded you. For then the LORD would have established your kingdom over Israel forever,

Then Saul said, "I've wronged you. Return, my son David, for I won't harm you again because my life was precious to you today. Look, I've acted foolishly and have made a very great mistake."