The ancient Greeks and Romans called foreigners who did not speak their language, next to which that of others seemed rude and unpleasant to them (like "bar-bar"). In the New Testament it only means "stranger of an unknown tongue" (Rom. 1:14; 1 Cor. 14:11; Acts 28:2-4).
It has the same meaning in Ps. 114:1.
It has come to designate the Greeks themselves from a religious point of view. In a more general sense, barbarian means uncultured, rude; thus, for example, Ez. 21:31.
Meaning of BARBARIAN
The ancient Greeks and Romans called foreigners who did not speak their language, next to which that of others seemed rude and unpleasant to them (like "bar-bar").