Apocryphal

adjective

1. Of, or pertaining to, the Apocrypha.
2. (by extension) Of doubtful authenticity, or lacking authority; not regarded as canonical.

   "Many scholars consider the stories of the monk Teilo to be apocryphal."

3. (by extension) Of dubious veracity; of questionable accuracy or truthfulness; anecdotal or in the nature of an urban legend.

   "There is an apocryphal tale of a little boy plugging the dike with his finger."