Толковый словарь английского языка Oxford English Reference - infallible

adj. 1 incapable of error. 2 (of a method, test, proof, etc.) unfailing; sure to succeed. 3 RC Ch. (of the Pope) unable to err in pronouncing dogma as doctrinally defined. Derivatives infallibility n. infallibly adv. Etymology: ME f. F infaillible or LL infallibilis (as IN-(1), FALLIBLE) INFAMOUS adj. 1 notoriously bad; having a bad reputation. 2 abominable. 3 (in ancient law) deprived of all or some rights of a citizen on account of serious crime. Derivatives infamously adv. infamy n. (pl. -ies). Etymology: ME f. med.L infamosus f. L infamis (as IN-(1), FAME)