Noah Webster's Dictionary 1. (a.) Not penitent; not repenting of sin; not contrite; of a hard heart. 2. (n.) One who is not penitent.

Multi-Version Concordance Impenitent (1 Occurrence) Romans 2:5 But after thy hardness and impenitent heart treasurest up unto thyself wrath against the day of wrath and revelation of the righteous judgment of God; (KJV WEY ASV DBY WBS YLT RSV)