infallibleness


in·fal·li·ble

I0124600 (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.