"Bonne foi" is a French term that translates to "good faith" in English, and it describes a person's intent or state of mind. There are several synonyms for "bonne foi" that can convey similar meanings. For instance, you could use terms like "sincerity," "honesty," "integrity," "uprightness," or "trustworthiness" to convey similar ideas. Other potential synonyms for "bonne foi" might include terms like "genuineness," "authenticity," "frankness," or "candor." Ultimately, the choice of synonym will depend on the context in which it is used, as well as the intended tone and emphasis of the speaker or writer.