Not voidable; incapable of being made null or void.
A confirmation is allied to a release, being a conveyance of an estate or right in esse whereby a voidable estate is made unavoidable
Something that cannot be avoided.
Forty years before, I had thought this odour one of the necessities of life — one of the unavoidables at least[…]
From Middle English unavoidable, equivalent to un- + avoidable.
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