Webster's English Dictionary

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infallible

in.fal.li.ble \(')in-'fal-*-b*l\ \-ble-\ aj [ML infallibilis, fr. L in- + 
   LL fallibilis fallible] 1: incapable of error : UNERRING {~ memory}  2: 
   SURE, CERTAIN {~ remedy}  3: incapable of error in defining doctrines 
   touching faith or morals  - in.fal.li.bly av