Apocryphal :: Apocryphal (a.) Not canonical. Hence: Of doubtful authority; equivocal; mythic; fictitious; spurious; false.
Apocryphalist :: Apocryphalist (n.) One who believes in, or defends, the Apocrypha..
Apocryphally :: Apocryphally (adv.) In an apocryphal manner; mythically; not indisputably.
Apocryphalness :: Apocryphalness (n.) The quality or state of being apocryphal; doubtfulness of credit or genuineness.