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]
Moby Thesaurus II by Grady Ward, 1.0:
23 Moby Thesaurus words for "addlepated":
addlebrained, addled, addleheaded, beclouded, befuddled,
blear-witted, cloudy, dizzy, fogged, foggy, fuddlebrained, fuddled,
hazy, in a fog, in a muddle, misted, misty, muddled, muddleheaded,
muddybrained, muzzy, puzzleheaded, scramblebrained