1
Stage 1 of 4
fides
Latin · ancient
"faith, trust"
faith, trust, giving rise to fidelis (faithful), combined with in- (not)
2
Stage 2 of 4
infidelis
Latin · ancient
"unfaithful, disbelieving"
unfaithful, disbelieving, from in- and fidelis
3
Stage 3 of 4
infidele
Old French · medieval
"a person of a different religious faith"
carried into French for a person of a different religious faith
4
Stage 4 of 4
infidel
English · 1400s
"a person who does not believe in a particular religion"
settled as the English word for a person who does not believe in a particular religion
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