Synonyms of unattested

1 Syllable
x
2 Syllables
pseudo, secret, whatsis, bearding
3 Syllables
unsigned, unnamed, nameless, unclaimed
4 Syllables
anonymous, unavowed, incognito, undisclosed, pseudonymous, uncredited, unspecified
5 Syllables
whatchamacallit, innominate, unidentified, unacknowledged, undesignated