pseudonymous
Concise Oxford English Dictionary © 2008 Oxford University Press:
pseudonymous /s(j)uːˈdɒnɪməs/
▶adjective writing or written under a false name.
– derivatives
pseudonymity /-ˈnɪmɪti/ noun,
pseudonymously adverb.
pseudonymity /-ˈnɪmɪti/ noun,
pseudonymously adverb.
'pseudonymous' also found in these Oxford entries:

