Infallible
来自Big Physics
late 15th century: from French infaillible or late Latin infallibilis, from in- ‘not’ + Latin fallere ‘deceive’.
wiktionary
From Medieval Latin infallibilis, from Latin in- + fallibilis. Compare French infaillible. Surface analysis in- + fallible.
etymonline
infallible (adj.)
"exempt from error in judgment, knowledge, or opinion," early 15c., from Medieval Latin infallibilis, from in- "not, opposite of" (see in- (1)) + Late Latin fallibilis (see fallible). In reference to Popes, attested from 1870, hence infallibilism, the doctrine of this; infallibilist. Related: Infallibly.
