Where does “dull” come from?

dull (Middle English) comes from Old English dol, from Proto-West Germanic *dol, from Proto-Germanic dulaz, from Proto-Germanic dwalaz, from Proto-Indo-European dʰwel-.

Ancestry of “dull”, step by step

StepLanguageWordMeaning
1Old Englishdolfoolish
2Proto-West Germanic*dol
3Proto-Germanicdulazconfused, stunned; foolish, misled, mad
4Proto-Germanicdwalazconfused, stunned; foolish, misled, mad
5Proto-Indo-Europeandʰwel-

Words derived from “dull

Every word from Proto-Indo-European dʰwel-