The Collaborative International Dictionary of English v.0.48:

Somedeal \Some"deal`\ (s[u^]m"d[=e]l`), adv.
   In some degree; somewhat. [Written also sumdel, sumdeale,
   and sumdele.] [Obs.] "She was somedeal deaf." --Chaucer.
   [1913 Webster]

         Thou lackest somedeal their delight.     --Spenser.
   [1913 Webster]