'Bitterly' in the Bible

Just as he finished speaking, the king’s sons entered and wept loudly. Then the king and all his servants also wept bitterly.

Deeply shaken, the king went up to the chamber overlooking the city gate, weeping bitterly and crying out as he went along, "My son Absalom! My son! My son Absalom! I wish I had died instead of you, Absalom my son, my son!"

Someone informed Joab, "The king is weeping bitterly, mourning for Absalom."