Thayer's Greek Lexicon

 1. one whose speech is rude, rough and harsh
2. one who speaks a foreign or strange language which is not
understood by another
3. used by the Greeks of any foreigner ignorant of the Greek
language, whether mental or moral, with the added notion after
the Persian war, of rudeness and brutality. The word is used
in the N.T. without the idea of reproachfulness.