I need the common phrase 'Persona non grata' to refer instead to numbers (though in singular) rather than people. My gut told me 'Numero non grata' but if it's the nominative case then maybe it should be 'Numerus non grata'?
This page lists all the case endings, but I'm not sure which is the one I'm looking for.
This page lists all the case endings, but I'm not sure which is the one I'm looking for.
