French fidèle

← French féal (mention)

← Old French fedel (mention)

← Old French feel (mention)

← Latin fidēlis (borrowed)

→ French fidélité (suffix)

→ French fidéliser (affix)

→ French fidèlement (suffix)

→ French infidèle (affix)

→ French féal (doublet)

→ Romanian fidel (borrowed)