infidel
noun/ˈɪnfɪdəl/, /ˈɪnfɪdel/
/ˈɪnfɪdəl/, /ˈɪnfɪdel/
(old-fashioned, disapproving)- used in some religions, especially in the past, to refer in a disapproving way to people who do not follow that religionWord Originlate 15th cent.: from French infidèle or Latin infidelis, from in- ‘not’ + fidelis ‘faithful’ (from fides ‘faith’, related to fidere ‘to trust’). The word originally denoted a person of a religion other than one's own, specifically a Muslim (to a Christian), a Christian (to a Muslim), or a Gentile (to a Jew).
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infidel