This compound adjective intensifies the concept of compassion, literally meaning 'much-boweled' (since the ancients located emotions in the inner organs). In James 5:11, it describes the Lord as 'very compassionate,' emphasizing the depth and abundance of His mercy. The term goes beyond ordinary kindness to express profound, visceral compassion—the kind that moves one's innermost being. God's mercy isn't measured or calculated but overflowing and abundant.