2. A rude, savage, alien, wild, uncivilized person.
3. An uncultured person, or someone who has no sympathy with literary culture.
4. Applied by nations, generally depreciatively, to foreigners; thus at various times and with various speakers or writers: non-Hellenic, non-Roman (most usual), non-Christian.
5. Uncultivated, uncultured, crude, unsophisticated, uncouth: "The artist accused the public of having barbarian tastes."
6. A foreigner, one whose language and customs differ from the speaker's.
From Greek barbaros, "non-Greek, foreign, barbarous," from an Indo-European imitative base barb, "to stammer, stutter; and unintelligible." The Greeks were quoted as saying that foreigners sounded as if they were saying, "Barbar, Barbar," which was, for the Greeks, unintelligible.
Barbarian, from Latin barbarus. It seems to have signified, at first, only a foreign or a foreigner; but, in time, it implied some degree of wildness or cruelty.