"Unmerited grace" refers to receiving kindness, forgiveness, or blessings even though we don't deserve or earn them. It is a gift or favor given to us without any reason to justify it. Full definition
And now we meet Paul's question: If we are all involved in the sin of humankind and even saints are sinners too, if godly perfection does indeed totally escape us, and if our only hope lies in the sheer unmerited grace of God, then isn't the whole Christian view of human existence reducible to some pathetic farce? (religion-online.org)
Protestants may make this case against eugenics by emphasizing unmerited grace. (religion-online.org)
Seeing himself a sinner who fell infinitely «short of the glory of God,» the salvation that Luther found through the redeeming death of Jesus Christ was for him a sheer gift of the most unmerited grace. (religion-online.org)