infallibleness


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in·fal·li·ble

 (ĭn-făl′ə-bəl)
adj.
1. Incapable of erring: an infallible guide; an infallible source of information.
2. Incapable of failing; certain: an infallible antidote; an infallible rule.
3. Roman Catholic Church Incapable of error in expounding doctrine on faith or morals.

[Middle English, from Medieval Latin īnfallibilis : Latin in-, not; see in-1 + Medieval Latin fallibilis, fallible; see fallible.]

in·fal′li·bil′i·ty, in·fal′li·ble·ness n.
in·fal′li·bly adv.