unexpected

unexpected
    adj 1: not expected or anticipated; "unexpected guests";
           "unexpected news" [ant: {expected}]
    

Unexpected \Unexpected\
   See {expected}.
    

Unexpected \Un`ex*pect"ed\, a.
   Not expected; coming without warning; sudden. --
   {Un`ex*pect"ed*ly}, adv. -- {Un`ex*pect"ed*ness}, n.
   [1913 Webster]
    

80 Moby Thesaurus words for "unexpected":
      abrupt, accidental, adventitious, aleatory, antic, breakaway,
      casual, causeless, chance, chancy, contingent, destinal, dicey,
      electrifying, extraordinary, fanciful, fantastic, fatal, fatidic,
      fluky, fortuitous, hasty, headlong, iffy, impetuous, impossible,
      improbable, impulsive, incidental, incomprehensible, inconceivable,
      incredible, indeterminate, more than expected, nerve-shattering,
      offbeat, out-of-the-way, past expectation, precipitant,
      precipitate, precipitous, quick, rare, recherche, risky, shocking,
      speedy, startling, sudden, sui generis, surprising, swift,
      unaccountable, unannounced, unanticipated, unbelievable, uncaused,
      uncommon, uncustomary, undetermined, undivined, undreamed-of,
      unfamiliar, unforeseeable, unforeseen, unguessed, unheard-of,
      unheralded, unhoped for, unimaginable, unique, unlooked-for,
      unordinary, unpredictable, unpredicted, unprepared for,
      unthought-of, unusual, unwonted, without warning