out of the blue

out of the blue
    adv 1: in a way that was not expected; "her brother showed up at
           the wedding out of the blue" [syn: {unexpectedly}, {out
           of the blue}]
    adj 1: not anticipated; "unanticipated and disconcerting lines
           of development"- H.W.Glidden; "unforeseen circumstances";
           "a virtue unlooked-for in people so full of energy";
           "like a bolt out of the blue" [syn: {unanticipated},
           {unforeseen}, {unlooked-for}, {out of the blue(p)}]
    

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