The Collaborative International Dictionary of English v.0.48:
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]WordNet (r) 3.0 (2006):
unexpectedness n 1: extraordinariness by virtue of being unexpected; "the unexpectedness of the warm welcome" [syn: unexpectedness, surprisingness] [ant: expectedness]