in·de·fea·si·ble /-ˈfizəbəl/
(a.)難使無效的,不能廢棄的
In·de·fea·si·ble a. Not to be defeated; not defeasible; incapable of being annulled or made void; as, an indefeasible or title.
That the king had a divine and an indefeasible right to the regal power. --Macaulay.
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indefeasible
adj : not liable to being annulled or voided or undone; "an
indefeasible right to freedom"; "an indefeasible claim
to the title" [ant: defeasible]