irredeemable

US /ˌɪr.əˈdiː.mə.bəl/
UK /ˌɪr.əˈdiː.mə.bəl/
1.

ไม่สามารถไถ่ถอนได้

impossible to correct, improve, or change:

:
There are irredeemable flaws in the logic of the argument.
1.

ไม่สามารถไถ่ถอนได้

bonds that pay interest but have no agreed date on which the borrower must pay the lender:

:
Irredeemables have no redemption date at all, so that interest on them will be paid indefinitely.