Unredeemable vs. Irredeemable

Not redeemable; irredeemable.

That cannot be bought back or paid off

Insusceptible of reform;

Not convertible into coin.

Impossible to remedy

Impossible to redeem or reform

Not redeemable; 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.

(finance) A financial instrument that cannot be freely redeemed.

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.

Insusceptible of reform;

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