secret
unappreciated
unavowed
unconfessed
undeclared
unrecognised
unrecognized
unsung
unvalued
anonymous
cryptonymic
cryptonymous
forgotten
hidden
ignored
ill-requited
ill-rewarded
incognito
innominate
nameless
neglected
uncredited
undefined
undesignated
unfairly neglected
unidentified
unknown
unnamed
unrequited
unrewarded
unspecified
unthanked
without a name
conjectural
deep-rooted
recognize
unattained
unchallenged
uncollected
unconsidered
undisclosed
undiscovered
unfelt
unheeded
unheralded
unnoted
unrealized
unreleased
unreported
unrevealed
unspoken
untapped
well-grounded