unpredicted

from WordNet (r) 3.0 (2006)

unpredicted
    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

35 Moby Thesaurus words for "unpredicted":
      abrupt, electrifying, extraordinary, hasty, headlong, impetuous,
      improbable, impulsive, more than expected, nerve-shattering,
      out-of-the-way, past expectation, precipitant, precipitate,
      precipitous, quick, shocking, speedy, startling, sudden,
      surprising, swift, unannounced, unanticipated, undivined,
      unexpected, unforeseeable, unforeseen, unguessed, unheralded,
      unhoped for, unlooked-for, unpredictable, unprepared for,
      without warning