- infidel
- 1460 (adj., n.), from M.Fr. infidèle, from L. infidelis "unfaithful," later "unbelieving," from in- "not" + fidelis "faithful" (see fidelity). In 15c. "a non-Christian" (especially a Saracen); later "one who does not believe in religion" (1526). Also used to translate Arabic kafir, 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" (1534).