Etymology

infallible

in·fal·li·ble
I1N1F4A1L1L1I1B3L1E1

Today it means: A person who, or an object or process that, is taken as being infallible. Full definition →

Medieval Latin īnfallibilis ← Latin in-
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The story

  1. Latin · derived fromin-
  2. Medieval Latin · borrowed fromīnfallibilis
  3. English todayinfallible

From Medieval Latin īnfallibilis, from Latin in- + fallibilis. Compare French infaillible. By surface analysis, in- + fallible.

Words from the same roots

Latinin- all →

intrusionenactinferinanimateintransigentincarcerateamainempriseen-impropriatein-incatenationinconcoctincremableirrealis

Etymology from Wiktionary, CC BY-SA 4.0.