unannounced

from WordNet (r) 3.0 (2006)

unannounced
    adj 1: without warning or announcement; "they arrived
           unannounced"; "a totally unheralded telegram that his
           daughter...died last night"- M.A.D.Howe [syn:
           {unannounced}, {unheralded}, {unpredicted}]

from Moby Thesaurus II by Grady Ward, 1.0

18 Moby Thesaurus words for "unannounced":
      extraordinary, improbable, more than expected, out-of-the-way,
      past expectation, sudden, unanticipated, undivined, unexpected,
      unforeseeable, unforeseen, unguessed, unheralded, unhoped for,
      unpredictable, unpredicted, unprepared for, without warning

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