Let's consider that in light of the example of the apostles. Their everyday language as Galileans was Aramaic, but they had learned, and continued to learn, the Old Testament in its original Hebrew. Paul, Peter, Matthew, and John obviously learned Greek--and given the location of their deaths, I'm guessing Paul and Peter probably picked up some Latin as well. "Doubting Thomas" established a church in India, and is reputed to be buried in Korea--so I'm guessing he must have picked up Hindi (or other Indian languages), Chinese, and Korean along the way. Other New Testament writer who were obviously multilingual were Luke, James, Jude, and the writer of Hebrews.
So were they unlearned men by the standards of their time, or ours? I'd have to suggest that they were only unlearned men in the standards of
What do you call a man who speaks three languages?
What do you call a man who speaks two languages?
What do you call a man who speaks only one language?