noun 1.Sometimes, in·fal·li·ble·ness. the quality of being
infallible, or of being absolutely trustworthy:
He believed in the infallibility of his leadership. 2.Roman Catholic Church. immunity from fallacy or
liability to
error in expounding matters of faith or morals by virtue of the promise made by Christ to the Church:
papal infallibility.
Related forms non·in·fal·li·bil·i·ty, noun
non·in·fal·li·ble·ness, noun