I am not sure, but these two words do have different qualities to me. The word 'grace' to me represents something given with pleasure, enjoyment, delight, and happiness, while the term 'undeserved kindness' implies to me something given with indisposition, displeasure, reluctance, and unwillingness. If a loved one needed $100 bucks, I could give it to them and be unhappy about it (thinking to myself, why did they ask me, or why couldn't they earn it themselves, or when am I going to get this back?)showing them 'undeserved kindness'; or I could give it to them knowing that they said they needed $100 dollars, full well knowing they may not pay me back and be extremely happy in giving it to them, because I care and love them showing them 'grace'! To me there is a difference in word choice!

If we could meet all of God’s requirements perfectly, it would be a deserved kindness for him to give us the blessings he has promised. But Jehovah God and Jesus Christ are showing us kindness that is “undeserved.” A Greek-English Lexicon of the New Testament, by J. H. Thayer, explains the meaning of the word used by the apostle Paul to describe this quality of God: “The word [kha´ris] contains the idea of kindness which bestows upon one what he has not deserved.” No works of ours can earn God’s blessing. It is, as Paul says, an undeserved kindness. If you are sincerely doing all you can within your limitations to fulfill your obligations to God, be happy at doing that. Jehovah asks no more of you. REFERENCE: w90 2/15 P.23 ---- The comments don't seem to be accepting my comments again... anyway I'll write it below: We are sinners. It is impossible to measure up to God's perfect standards. If we could, then it would be deserved kindness, but, since we cannot, then God is showing kindness still but he doesn't have to, therefore, it is undeserved. If you believe your definition and semantics is more accurate than anyone else's, well, that's your perogative, but I don't have to agree. In other articles the translators never said that 'grace' was wrong. They mention that behind that greek word there is a fuller meaning that needed to be expounded. Grace is not wrong and neither is undeserved kindness. One of Grace's definition is: a disposition to kindness and compassion. Since nothing we can do can be deemed as derserving of God's Grace, God shows undeserved grace.

The original koine greek word used was χαρις (khar'-ece). The English word "grace" is not derived from χαρις, it comes from the Latin gratia. χαρις was basically used in secular Greek in an aesthetic sense, but it also had an ethical side. The New Testament writers drew upon this ethical usage to connote a benevolence that shows favor to inferiors. It then seems apparent that the single word "grace" lacks the power to express the full force of χαρις.