[in-fal-uh-buh
l] 
| 1. | absolutely trustworthy or sure: an infallible rule. |
| 2. | unfailing in effectiveness or operation; certain: an infallible remedy. |
| 3. | not fallible; exempt from liability to error, as persons, their judgment, or pronouncements: an infallible principle. |
| 4. | Roman Catholic Church. immune from fallacy or liability to error in expounding matters of faith or morals by virtue of the promise made by Christ to the Church. |
| 5. | an infallible person or thing. |
| in·fal·li·ble (ĭn-fāl'ə-bəl) adj.
[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. |