indefeasible
Adjective
Meaning
Not to be defeated; not defeasible; incapable of being annulled or made void; as, an indefeasible or title.
Source: Webster's dictionarySynonyms
certain
constant
permanent
absolute
sure
constitutional
lasting
inherent
chronic
innate
inert
irreversible
chartered
relentless
immutable
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Antonyms
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an indefeasible right to freedom
an indefeasible claim to the title