The Collaborative International Dictionary of English v.0.48:

Unblessed \Un*blessed"\, Unblest \Un*blest\, a. [Pref. un- not +
   blessed, blest.]
   Not blest; excluded from benediction; hence, accursed;
   wretched. "Unblessed enchanter." --Milton.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Unblest \Unblest\
   See blest.