[Greek] βάρβαρος (barbaros): foreigner, barbarian, rude and harsh, ignorant, uncouth, uncivilized, who does not speak Greek, who does not speak Latin; Rom.1:14, 1Cor.14:11, Act.28:2, Col. 3:11
The Greeks fighting barbarians
Background Information:
Greek Hellenism: This term means barbarous, foreign, brutal, rude, and non-Greek. Xenophon’s Anabasis 5.4.34 states “They were set down by the Greeks who served through the expedition as the most uncivilized people whose country they traversed.” Aeschylus’ Persians 255 states “And yet, Persians, I must relate the entirety of the calamity–the whole barbarian host is lost.” Aeschylus’ Agamemnon 1051 states “Well, if her language is not strange and foreign, I must speak within her comprehension and move her to reply.” This term originally did not have a negative sense. This term simply meant someone who did not speak the Greek language. When the Roman Empire conquered Greece, barbarians were considered those not influenced by the Greco-Roman culture. The Jews also considered the Zealots as barbarians.
Old Testament: This term means brutish, stupid, unintelligent, alien, non-Jewish, and stammering. When Israel came forth from Egypt, the house of Jacob from an alien people (Psa.114:1). I was stupid and could not understand, I was like a brute beast in your presence (Psa.73:22). Whoever loves discipline loves knowledge, but whoever hates reproof is stupid (Pro.12:1). I am more brute than human being, without even human intelligence (Pro.30:2).
New Testament: This term means native, non-Greek, foreigner, and barbarian. After Paul’s shipwreck, the natives show Paul great hospitality by lighting a fire and welcoming him. The natives thought that Paul was destined to a murderer’s fate by being bitten by a snake. Paul is under obligation to preach the Gospel to Greeks and non-Greeks alike. Paul considered himself as a foreigner to one who speaks a different language. Christ accepts all people, even barbarians.
Scripture:
“The natives (of Malta) showed us extraordinary hospitality.” Act. 28:2
Upon his shipwreck on the island of Malta, Paul recounts the natives welcoming him. Malta resides near the tip of southern Italy. These ‘barbarians’ showed Paul hospitality.
“But if I do not know the meaning of a language, I shall be a foreigner to one who speaks it, and the one who speaks it a foreigner to me.” 1 Cor. 14:11
The foreigner is considered as someone not participating Greco-Roman culture or civilization.
“Here there is not Greek and Jew, circumcision and uncircumcision, barbarian, Scythian, slave, free; but Christ is all and in all.” Col. 3:11
Paul states that all distinctions are null and void in Christ. Regardless of the culture or civilization, each ethnic group seems to be able to point to another group being more uncivilized. The Scythians were viewed a barbaric people north of the Black Sea.
Conclusion:
Barbarian, barbaric
Greek becomes the standard international language in the Mediterranean world. From this term comes the words barbarian and barbaric. Today, the word barbarian continues to be defined as uncivilized, crude, or brutal person in current times. In other word, everyone pretty much knows what a barbarian is. 
The Roman Empire fighting barbarians