From BiblePortal Wikipedia

Webster's Dictionary [1]

(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 [2]

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.