Since my current fiction is historical mysteries set in ancient Egypt, I thought this would be a great word to share for today, barbarian, thanks to the book, Wicked Words.
Barbarian - an uncouth, uncultured, uncivilized person, especially one who is fierce and brutal. The barbarian is the quintessential outsider. The word comes from barbaros, the ancient Greek term for anyone who couldn't be understood because he didn't speak Greek. It derives ultimately from baba, an Indo-European root that imitates the incoherent speech of a baby. Originally a relatively neutral term for a foreigner, the Greek word began to acquire pejorative connotations following the Persian invasions of Greece under Darius and Xerxes in the fifth century BCE.
Those wacky Greeks; unless you were Greek, you were a barbarian.