Where does “infidélité” come from?

infidélité (Middle French) comes from Latin infidelitas, from Latin īnfidēlis, from Latin fidēlis, from Latin fidēs, from Proto-Italic feiðos, from Proto-Indo-European bʰeydʰos, from Proto-Indo-European bʰeydʰ- — to compel, force; to trust.

Ancestry of “infidélité”, step by step

Step	Language	Word	Meaning
1	Latin	infidelitas	unfaithfulness, faithlessness, infidelity
2	Latin	īnfidēlis	unfaithful
3	Latin	fidēlis	faithful, loyal
4	Latin	fidēs	—
5	Proto-Italic	feiðos	faithful, reliable
6	Proto-Indo-European	bʰeydʰos	faithful, trustworthy
7	Proto-Indo-European	bʰeydʰ-	to compel, force; to trust

Words derived from “infidélité”

infidelity

Every word from Proto-Indo-European bʰeydʰ- →Every word from Proto-Indo-European bʰeydʰos →Every word from Proto-Italic feiðos →