Where does “unbrushable” come from?

unbrushable (English) comes from English brushable, from English Brush, from Middle English brusshe, from Old French broisse, from Vulgar Latin brustia, from Icelandic bursti, from Proto-Germanic burstiz, from Proto-Germanic bʰurstís — top, tip, point.

unbrushable (English): Not brushable

Definitions

  1. Not brushable

Ancestry of “unbrushable”, step by step

unbrushable traces back through two separate lines of ancestry.

via English brushable

StepLanguageWordMeaning
1EnglishbrushableAble to be brushed; Able to be controlled by...
2EnglishBrushAn implement consisting of multiple more or less flexible bristles or other filaments attached to a handle, used for any of various purposes including cleaning, painting, and arranging hair
3Middle Englishbrusshe
4Old Frenchbroisse
5Vulgar Latinbrustia
6Icelandicburstibrush
7Proto-Germanicburstizbristle
8Proto-Germanicbʰurstís
9Proto-Indo-Europeanbʰr̥s-tí-s
10Proto-Indo-Europeanbʰers-top, tip, point

via English un

StepLanguageWordMeaning
1EnglishunOne
Every word from Proto-Indo-European bʰers-Every word from Proto-Indo-European bʰr̥s-tí-sEvery word from Proto-Germanic bʰurstís