1. Insusceptible of reform
   "irredeemable sinners";
   - irreclaimable, unredeemable, unreformable
    
2. (of paper money) not convertible into coin at the pleasure of the holder
   "The irredeemable currency lost value during the economic crisis"
    
3. (finance) not able to be converted into cash or reclaimed
   "irredeemable bonds have no maturity date";
   - unredeemable

See also: inconvertible, unconvertible, unexchangeable, wicked

Encyclopedia: Irredeemable