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).
例文
1. He promised to continue the fight against infidel forces.
彼は異教勢力に対抗し続けることを約束した。
2.He had some letters，and was ingenious，but he was an infidel .
彼にはいくつかの学問があり、見識があり、宗教には無関心である。
3.He 's a subversive infidel rebellious alike against his God and his king.
彼は神に反逆し、君主に反逆する転覆専門の異教徒だ。
4.Bow before your god, infidel .I am the Master here.