Apocryphal (suomeksi)

apokryfinen (a: of or pertaining to Apocrypha / of doubtful authenticity / of dubious veracity; urban legend)
hämäräperäinen (a)
epäilyttävä (a: of doubtful authenticity / of dubious veracity; urban legend)
epäuskottava (a: of doubtful authenticity / of dubious veracity; urban legend)