1. 
[syn: unanticipated, unforeseen, unlooked-for, out of the blue(p)]
The Collaborative International Dictionary of English v.0.48:
Unlooked-for \Un*looked"-for\, a.
   Not looked for; unexpected; as, an unlooked-for event.
   [1913 Webster]
WordNet (r) 3.0 (2006):
unlooked-for
    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)]