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indefeasible (adj.)

"not to be set aside or overcome," 1530s (implied in indefeasibly), from in- (1) "not, opposite of" + defeasible (see defeasance).

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Definitions of indefeasible from WordNet

indefeasible (adj.)
not liable to being annulled or voided or undone;
an indefeasible right to freedom
an indefeasible claim to the title
From wordnet.princeton.edu