English
addleheaded
From addle + headed.
Proto-Germanic *adalaz ‘liquid manure’
Proto-West Germanic *adal
Old English adel ‘mire, pool, liquid excrement’
Middle English adel ‘rotten’
English addle
Today it means
adj Addled; confused; stupid; flustered.
Language periods are conventional ranges, not dates for this word.
Etymograph / addleheaded