Bona fide means "in good faith" in Latin. When applied to business deals and the like, it stresses the absence of fraud or deception. A bona fide sale of securities is an entirely aboveboard transaction. Outside of business and law, bona fide implies mere sincerity and earnestness. A bona fide promise is one that the person has every intention of keeping. A bona fide proposal of marriage is one made by a suitor who isn't kidding around. Bona fide also has the noun form bona fides; when someone asks about someone else's bona fides, it usually means evidence of their qualifications or achievements.