addle-headed

from The Collaborative International Dictionary of English v.0.48

Addle-brained \Ad"dle-brained`\, Addle-headed \Ad"dle-head`ed\,
Addle-pated \Ad"dle-pa`ted\, a.
   Dull-witted; stupid. "The addle-brained Oberstein." --Motley.
   [1913 Webster]

         Dull and addle-pated.                    --Dryden.
   [1913 Webster]