irredeemable

adjectives

insusceptible of reform
"vicious irreclaimable boys"; "irredeemable sinners"
irreclaimable, irredeemable, unredeemable, unreformable
(of paper money) not convertible into coin at the pleasure of the holder
irredeemable
is similar to
used especially of currencies; incapable of being exchanged for or replaced by another currency of equal value
inconvertible, unconvertible, unexchangeable