indefeasible

That which cannot be defeated, revoked, or made void. This term is usually applied to an estate or right that cannot be defeated.

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indefeasible adj. cannot be altered or voided, usually in reference to an interest in real property.

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indefeasible adjective binding, confirmed, established, immutable, imperishable, in perpetuum ratus, inalienable, incapable of being defeated, incapable of being revoked, incontestable, incontrovertible, indestructible, indissoluble, indubitable, ineradicable, inextinguishable, insusceptible of change, invariable, inviolable, irrefragable, irreversible, irrevocable, nonreversible, not forfeitable, not to be abrogated, not to be annulled, not to be made void, permanent, reverseless, settled, unalterable, unchallengeable, unchangeable, undefeatable, undeniable, unquestionable
Associated concepts: indefeasible estate, indefeasible interrst, indefeasible title, indefeasibly vested

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See also: certain, clear, compulsory, conclusive, definite, determinative, incontestable, indelible, indestructible, irreversible, irrevocable, permanent, positive, unalienable, unavoidable

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INDEFEASIBLE. That which cannot be defeated or undone. This epithet is usually applied to an estate or right which cannot be defeated.