Good faith (Latin: bona fides) is fair and open dealing in human interactions. This is often thought to require sincere, honest intentions or belief, regardless of the outcome of an action. While some Latin phrases lose their literal meaning over centuries, this is not the case with bona fides; it is still widely used and interchangeable with its generally accepted modern day translation of good faith. It is an important concept within law, philosophy, and business. The opposed concepts are bad faith, mala fides (duplicity) and perfidy (pretense). In contemporary English, the usage of bona fides (note the "s") is synonymous with credentials and identity. The phrase is sometimes used in job advertisements, and should not be confused with the bona fide occupational qualifications or the employer's good faith effort, as described below.

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