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infallible (adj.)
[infallible 词源字典]
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. Related:
Infallibly
.
[infallible etymology, infallible origin, 英语词源]