Source : Webster's Revised Unabridged Dictionary (1913)

Unhoped-for \Un*hoped"-for\, a.
   Unhoped; unexpected.

Source : WordNet®

unhoped-for
     adj : so unexpected as to have not been imagined; "an unhoped-for
           piece of luck"; "an unthought advantage"; "an
           unthought-of place to find the key" [syn: {unhoped}, {unthought},
            {unthought-of}]