The Collaborative International Dictionary
Fictitiousness
Fictitious \Fic*ti"tious\, a. [L. fictitius. See Fiction.] Feigned; imaginary; not real; fabulous; counterfeit; false; not genuine; as, fictitious fame.
The human persons are as fictitious as the airy ones.
--Pope.
-- Fic*ti"tious*ly, adv. -- Fic*ti"tious*ness, n.
Wiktionary
fictitiousness
n. The state of being fictitious.