Where does “harebrained” come from?

harebrained (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,...

harebrained (English): Absurd, foolish or stupid; Frivolous and silly;...

Definitions

  1. Absurd, foolish or stupid; Frivolous and silly;...

Ancestry of “harebrained”, step by step

harebrained 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 Hare

StepLanguageWordMeaning
1EnglishHareOS grid ref ST2915
2Frankishhariōnto ruin, lay waste, ravage, plunder, destroy
3Proto-Germanicharjōnąto overrun with an army; lay waste; ravage;...
4Proto-Indo-Europeankóryoswar; troops; army; war, troops
5Proto-Indo-Europeanḱer-to grow, to make grow, to nourish; to plait,...
6Proto-Indo-Europeankr̥-to turn, to bend
7Proto-Indo-Europeanker-army
Every word from Proto-Indo-European men-Every word from Proto-Indo-European mregʰnomEvery word from Proto-Germanic bragną