A misunderstanding of these expressions has doubtless caused many to be skeptical and infidelic.
"Delices is infidelic," was the cry, and this doubtless had something to do with Voltaire's establishing himself at Ferney.
This is so plain that no student of the Bible, unless he means purposely to be infidelic, will dispute the fact.
mid-15c. (adjective and noun), from Middle French infidèle, from Latin infidelis "unfaithful, not to be trusted," later "unbelieving," from in- "not, opposite of" (see in- (1)) + fidelis "faithful" (see fidelity). In 15c. "a non-Christian" (especially a Saracen); later "one who does not believe in religion" (1520s). Also used to translate Arabic qafir, which is from a root meaning "to disbelieve, to deny," strictly referring to all non-Muslims but virtually synonymous with "Christian;" hence, from a Muslim or Jewish point of view, "a Christian" (1530s; see kaffir).