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infidels
Simplified etymology
Infidel comes from Latin infidelis, meaning “not faithful,” based on fides, “faith.” It originally denoted someone belonging to a religion other than one’s own; the same Latin word also lies behind infidelity.
Etymology
From Middle French infidele, from Latin infidelis ('unfaithful'), formed from in- ('not') + fidelis ('faithful'), the source of fidelity. English narrowed the word from general unfaithfulness to religious unbelief. Because it has often been used contemptuously for outsiders, modern use can be offensive.