Webster's Revised Unabridged Dictionary · 1913

Barbarous

Barbarous ({not transcribed}) , adjective

[Latin barbarus, Greek ba`rbaros, strange, foreign; later, slavish, rude, ignorant; akin to Latin balbus stammering, Sanskrit barbara stammering, outlandish. Compare Brave, a.]

1.
Being in the state of a barbarian; uncivilized; rude; peopled with barbarians; as, a barbarous people; a barbarous country.
2.
Foreign; adapted to a barbaric taste. [Obsolete]
Barbarous gold. — Dryden
3.
Cruel; ferocious; inhuman; merciless.
By their barbarous usage he died within a few days, to the grief of all that knew him. — Clarendon
4.
Contrary to the pure idioms of a language.
A barbarous expression — G. Campbell