1
Stage 1 of 3
fides
Latin · ancient
"faith, trust"
faith, trust, combined with per- (through, used to mean against)
2
Stage 2 of 3
perfidia
Latin · ancient
"treachery, breaking of faith"
treachery, breaking of faith, from per- and fides
3
Stage 3 of 3
perfidy
English · 1500s
"deceitfulness and untrustworthiness"
settled as the English word for deceitfulness and untrustworthiness
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