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Definition of barbarous : 1. Being in the state of a barbarian; uncivilized; rude; peopled with barbarians; as, a barbarous people; a barbarous country.
2. Contrary to the pure idioms of a language.
3. Cruel; ferocious; inhuman; merciless.
4. Foreign; adapted to a barbaric taste.

Synonyms:

Neanderthal, kind, wolfish, condemnable, reprehensible, pitiless, butcherly, criminal, untrained, illiterate, primitive, noncivilized, fierce, naive, roughshod, natural, monstrous, unqualified, untamed, beastly, uneducated, fell, uncivilised, truculent, untried, atrocious, ferine, venomous, unkind, be unused to (doing) something, inhumane, fiendish, uncharitable, poisonous, brute, wild, feral, inexperienced, barbaric, uncultured, barbarian, vicious, unskilled, hateful, noncivilised, heartless, heavy-handed, evil, unsophisticated, awful, uninitiated, uncultivated, merciless, furious, unrelenting, sadistic, deplorable, culture, hard, wanton, heathenish

cruel, bestial, rough, ferocious, inhuman, ruthless, brutal, carnal, savage

gross, vulgar, tasteless, raw, undignified, crude, awkward, rude, earthy, boorish, tactless, clumsy, gawky, brutish, uncivil, unpolished, unrefined, coarse, tawdry, inelegant, graceless

heathen, sectarian, Bohemian, iconoclastic, heterodox, pagan, fetishistic, demonical, nonreligious, animalistic, nonconforming, idolatrous, non-Christian, atheistic, unscriptural, unchristian, nonorthodox, unorthodox, non-believing, factional, dissenting, pantheistic, heretic

discourteous, impertinent, brash, uncouth, ill-mannered, contemptuous, caddish, uncivilized, disrespectful, impolite

Usage examples:

• For a high- spirited gentleman like your father to approve, or at least accept, an act so barbarous is incomprehensible. - "The Complete Project Gutenberg Works of George Meredith", George Meredith.
• But it is peculiarly an evil when palpably not a just war, and when carried on against a barbarous people. - "Leading Articles on Various Subjects", Hugh Miller.
• The country was still in a most barbarous state. - "The Haskalah Movement in Russia", Jacob S. Raisin.