Like this puzzle you'd mess up on originally

Wiktionary Word definitions in Wiktionary
a. 1 of or pertaining to a pseudonym 2 (context of a name English) fictitious

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1766, from Modern Latin pseudonymus , from Greek pseudonymos (see pseudonym ). Related: Pseudonymously .\n

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Pseudonymous \Pseu*don"y*mous\, a. [Gr. ?; pseydh`s false + ?, ?, a name: cf. F. pseudonyme. See Pseudo- , and Name .] Bearing a false or fictitious name; as, a pseudonymous work. -- Pseu*don"y*mous*ly , adv. -- Pseu*don"y*mous*ness , n.

WordNet Word definitions in WordNet
adj. bearing or identified by an assumed (often pen) name; "the writings of Mark Twain are pseudonymous"