unbrushable
adjEtymology From un- + brushable.
1
Not brushable.
- My pluckly little friend Dash was (considering his small offensive powers) the bravest of the brave; for his winning way of bringing stones or anything else he could pick up to you, whenever he wanted a caress, or some little tit-bit to eat, had completely ground down his teeth to an unbrushable size.1880, Sir Stephen Bartlet Lakeman, What I Saw in Kaffir-land, page 134: