hårsår (Norwegian Bokmål) comes from Norwegian Bokmål sår, from Old Norse sár, from Proto-Germanic sairą, from Proto-Germanic sairaz, from Proto-Indo-European seh₂yro-, from Proto-Indo-European seh₂y- — to bind; to be fierce, afflict; to tie, bind.
hårsår (Norwegian Bokmål): touchy, easily offended; petulant
hårsår traces back through two separate lines of ancestry.