faceless
nameless
unidentified
unknown
unnamed
closet
cryptonymic
cryptonymous
incognito
inmost
innermost
innominate
interior
intimate
inward
isolated
personal
private
privy
retired
secluded
sequestered
unacknowledged
undefined
undesignated
unrecognized
unspecified
withdrawn
without a name
above
confidential
early
literary
well-known
autonomous
synonymous