Feigned; imaginary; not real; fabulous; counterfeit; false; not genuine; as, fictitious fame.

formed or conceived by the imagination; "a fabricated excuse for his absence"; "a fancied wrong"; "a fictional character"; "used fictitious names"; "a made-up story"

For literary uses see Fiction

adopted in order to deceive; "an assumed name"; "an assumed cheerfulness"; "a fictitious address"; "fictive sympathy"; "a pretended interest"; "a put-on childish voice"; "sham modesty"