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
Ancestry of “unbrushable”, step by step