unacknowledged

from WordNet (r) 3.0 (2006)

unacknowledged
    adj 1: not recognized or admitted [ant: {acknowledged}]
    2: not openly acknowledged; "an unacknowledged emergency"

from The Collaborative International Dictionary of English v.0.48

Unacknowledged \Unacknowledged\
   See {acknowledged}.

from Moby Thesaurus II by Grady Ward, 1.0

24 Moby Thesaurus words for "unacknowledged":
      anonymous, cryptonymic, cryptonymous, forgotten, ignored,
      ill-requited, ill-rewarded, incognito, innominate, nameless,
      neglected, uncredited, undefined, undesignated, unfairly neglected,
      unidentified, unknown, unnamed, unrecognized, unrequited,
      unrewarded, unspecified, unthanked, without a name