Impenitent - "Not feeling regret about one's sin or sins"
This was our state before God softened our hearts and led us to repentance: Romans 2:5 "But because of your hard and impenitent heart you are storing up wrath for yourself on the day of wrath when god's righteous judgement will be revealed."
What concerns me is that there are many times when I allow my heart to grow "hard and impenitent" in regards to my sin. This is directly contrary to what state I should be in, in light of the gospel. God has freed me from hardness of heart and has imparted upon me sufficient grace to repent and be sanctified.