infallibleness en · NOUN
Etymology
From infallible + -ness.
Meanings
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(uncountable) The quality of being infallible.
Our schoolmen make distinction of a certainty, evident and inevident. […] Inevident, which arises not so much out of the intrinsical truth of the proposition itself, as out of the veracity and infallibleness of the party that affirms it.
c. 1655, Joseph Hall, Good Security (sermon)