barbaroi

"Thus the Greeks stigmatized non-Greek speakers as 'barbarians' (speakers of mumbo-jumbo, a non-language). The 'Welsh' were foreigners, people who spoke 'a strange language' that 'one does not understand' (cited in the OED, 1648)." "One's own language, on the other hand, was glorified as the language of God (Arabic, Dutch, Sanskrit), the language of reason, logic and human rights (French in recent centuries) the language of the superior ethno-national group (German in Nazi Ideology)."1

Lollards, followers of John Wyclif, first translator of Bible into English, were called, derisively, "speakers of nonsense"2 .

mleccha: "This is the precise Sanskrit equivalent of the Greek barbaros , defined as someone who did not speak Sanskrit"3 The Russian word for Germans is Nemcy , Polish Niemcy , which means "mute" and was used, originally, by the Russians to refer to anyone west of Slavic-speaking lands who couldn't communicate in Russian.