Since enormous is from Latin, stems tend to be Latin. `ness` generally only is morphologically productive with Germanic roots, kindness, happiness, etc.
When I visited Iceland, I remember a sign in English that said a cliff was insafe [sic]. `in` being a Latin morpheme, and safe being Germanic.
When I visited Iceland, I remember a sign in English that said a cliff was insafe [sic]. `in` being a Latin morpheme, and safe being Germanic.