'Weak' in the Bible

Asa cried out to the LORD his God, telling him, "LORD, there is no one except for you to help between the powerful and the weak. So help us, LORD God, because we're depending on you and have come against this vast group in your name. LORD, you are our God. Let no mere mortal man defeat you!"

Meanwhile, somebody drew his bow and struck the king of Israel at a weak spot where his armor plates joined, so he instructed his chariot driver, "Turn around and take me out of the battle, because I've been severely wounded."