'Barbarian' in the Bible

Therefore, if I do not know the meaning of the language, I will be a barbarian to the one who is speaking, and the one who is speaking [will be] a barbarian in my [judgment].

where there is neither Greek nor Jew, circumcision nor uncircumcision, barbarian, Scythian, slave, [or] free, but Christ [is] all, and in all.