What is the term for something that may not be genuine or is of dubious origin?

The term "apocryphal" refers to something that is of dubious authenticity or uncertain origin, often used to describe stories, writings, or claims that are widely circulated but whose truthfulness is questionable. This word stems from historical contexts where certain texts were deemed non-canonical or of doubtful legitimacy. When applied, it conveys skepticism regarding the veracity of the subject in question, highlighting that it may not be a genuine account or may lack credible evidence.

The other options present alternative meanings that do not fit the context of dubious authenticity. "Apposite" signifies something relevant or appropriate, "apostate" describes a person who renounces a belief or faith, and "errant" refers to something straying from the proper course, which does not inherently imply a lack of genuineness. Thus, "apocryphal" is clearly the most suitable word for something that may not be genuine or is of dubious origin.