infuriated, unmerciful, angered, fearsome, frightful, enraged, unrestrained, merciless, roughshod, fiery, barbaric, help, untrained, uncivilized, feral, angry, tearing, maddened, impetuous, barbarian, bloodthirsty, boisterous, bowelless, vicious, kind, trigger-happy, cutthroat, murderous, fell, truculent, ravenous, sanguinary, wolfish, pitiless, uncultivated, ferine, tempestuous, predatory, untamed, uncivilised
brutal (part of speech: adjective)
violent (part of speech: adjective)
- For, such a perfection in training ferocious animals is extremely rare. - "By Water to the Columbian Exposition", Johanna S. Wisthaler.
- I am glad you marked the names on the back, for really it is difficult to believe that that ferocious- looking bearded person is really you! - "Betty Trevor", Mrs. G. de Horne Vaizey.
- The priest had spared no pains to excite them; and they imagined- the ferocious brutes! - "The Last Days of Pompeii", Edward George Bulwer-Lytton.