Where does “dullbrained” come from?

dullbrained (English) comes from English brained, from English brain, from Middle English brayn, from Old English bræġn, from Proto-West Germanic *bragn, from Proto-Germanic bragną, from Proto-Indo-European mregʰnom, from Proto-Indo-European men- — to think, mind; spiritual activity; to stay,...

Ancestry of “dullbrained”, step by step

dullbrained traces back through two separate lines of ancestry.

via English brained

StepLanguageWordMeaning
1EnglishbrainedHaving a particular kind or number of brain;...
2EnglishbrainThe control center of the central nervous system...
3Middle EnglishbraynThe brain or cerebrum; the organ of thought;...
4Old Englishbræġnbrain
5Proto-West Germanic*bragnbrain
6Proto-Germanicbragnąbrain
7Proto-Indo-Europeanmregʰnomskull, brain
8Proto-Indo-Europeanmen-to think, mind; spiritual activity; to stay,...

via English dull

StepLanguageWordMeaning
1EnglishdullLacking the ability to cut easily; not sharp;...
2Middle Englishdull
3Old Englishdolfoolish
4Proto-West Germanic*dol
5Proto-Germanicdulazconfused, stunned; foolish, misled, mad
6Proto-Germanicdwalazconfused, stunned; foolish, misled, mad
7Proto-Indo-Europeandʰwel-
Every word from Proto-Indo-European men-
dullbrained — Etymology, Origin & Word History | Etymology Explorer