The Collaborative International Dictionary of English v.0.48:

Splenitive \Splen"i*tive\, a.
   Splenetic. --Shak.
   [1913 Webster]

         Even and smooth as seemed the temperament of the
         nonchalant, languid Virginian -- not splenitive or
         rash.                                    --T. N. Page.
   [1913 Webster]