barbaric

adjective

1 the regime's barbaric crimes were exposed after the war was over:

cruel, brutal, barbarous, brutish, bestial, savage, vicious, fierce, ferocious, wicked, nasty, ruthless, remorseless, merciless, villainous, murderous, heinous, nefarious, monstrous, base, low, low-down, vile, inhuman, infernal, dark, fiendish, hellish, diabolical, ghastly, horrible.

▷antonyms benevolent.

2 he tore the raw chicken apart with barbaric strength:

uncivilized, primitive, unsophisticated, barbarous, heathen;

wild, brutish, Neanderthal, barbarian;

thuggish, loutish;

uncouth, coarse, rough, boorish, oafish, vulgar;

archaic rude.

▷antonyms civilized.

barbaric Oxford Dictionary of English