From BiblePortal Wikipedia
Webster's Dictionary 
(1): (a.) Cruel; ferocious; inhuman; merciless.
(2): (a.) Contrary to the pure idioms of a language.
(3): (a.) Foreign; adapted to a barbaric taste.
(4): (a.) Being in the state of a barbarian; uncivilized; rude; peopled with barbarians; as, a barbarous people; a barbarous country.
King James Dictionary 
B'Arbarous, a. Uncivilized savage unlettered untutored ignorant unacquainted with arts stranger to civility of manners.
Thou are a roman be not barbarous.
2. Cruel ferocious inhuman as barbarous.