Impermeable - Material that does not permit fluids to pass through it.
So my sister shows me this posh new water called FIJI. On the back is a little graphic showing where the water comes from. So apparently it rains unto a volcano, and then goes through the dirt, and then somehow magically gets past this barrier labeled “impermeable rock”, and then shoots out in the form of a FIJI bottle. So how exactly, I wonder, does water get through a material that, by definition, doesn’t allow water through it?