Usage Note
Infiel means unfaithful in a personal relationship (ser infiel = to cheat on a partner) and historically denoted a non-believer or infidel in a religious context. The same form is used for both genders. As a noun, un infiel can mean a cheater or (historically) a non-believer. The antonym is fiel.
Examples
"Descubrió que su pareja le había sido infiel."
Natural Translation
She discovered that her partner had been unfaithful to her.

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