adjective1. (of bonds, debentures, shares, etc) without a date of redemption of capital; incapable of being bought back directly or paid off
2. (of paper money) not convertible into specie
3. (of a sinner) not able to be saved or reformed
4. (of a loss) not able to be recovered; irretrievable
5. not able to be improved or rectified; irreparable