irredeemable

That cannot be bought back or paid off.

Not convertible into coin.

Impossible to remedy.

Impossible to redeem or reform.

Not redeemable; that cannot or need not be redeemed or made good by payment or restitution; not to be restored or escaped: as, irredeemable paper money; an irredeemable loss; irredeemable slavery.

Beyond the power of redemption; irreclaimable: as, irredeemable criminals or crime.

Not redeemable; that can not be redeemed; not payable in gold or silver, as a bond; — used especially of such government notes, issued as currency, as are not convertible into coin at the pleasure of the holder.

Not redeemable; unredeemable; not able to be restored, recovered, revoked, or escaped.

Not able to be cancelled by a payment or converted to another form of currency or financial instrument, especially one considered more secure or reliable.

(of paper money) not convertible into coin at the pleasure of the holder