Barbarians

Barbarians were originally those who could not speak Greek. Later it denoted the community or tribe not belonging to one of the great civilizations - Greek, Roman, and Christian. However, it ultimately become synonymous with the uncivilised and people without culture, particularly literary, this is the sense in which Matthew Arnold used it.

A member of such a community is called barbarian, and also anything of or relating to those ancient barbarians. It also refers to someone who is uncultured and brutish.