infallible
in·fal·lible
adjective
Origin
From Medieval Latin īnfallibilis, from Latin in- + fallibilis. Compare French infaillible. By surface analysis, in- + fallible.
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.