for uncivilized people is βάρβαροι (barbari- barbarians) for slaves is σκλάβος (sklabos)
Barbarians
βάρβαροι [varvari] = barbarians
The ancient Greeks used the word βάρβαρος (barbaros/barbarian) for uncivilized people. Actually they used it for all non-greek cultures.
For an outsider is: "αλλοδαπος" (alodapos), "ξένος" (ksenos). For an uncivilized person is: "απολίτιστος" (apoleeteestos), "βάρβαρος" (varvaros)
Xenos is outsiders or foreigners. Barbaros means barbarians. :P
Greek
Lack of culture led the people to become uncivilized.
The word "barbarian" comes from the Latin word "barbarus," which originally referred to non-Greek speakers who were considered uncivilized or primitive. It was later adopted into English and various other languages to refer to people perceived as uncultured or savage.
the original meaning is people from vassals. Practically slaves. helots είλωτες (ilotes) from the word είλως - vassal
The Greek word for slave is Doulos.
Barbarian.
the word is barbaric and it means uncivilized