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Definition of ferocious : Fierce; savage; wild; indicating cruelty; ravenous; rapacious; as, ferocious look or features; a ferocious lion.

Synonyms:

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

carnal, rude, barbarous, coarse, cruel, brutal, ruthless, brutish, rough, gross, inhuman, bestial

fighting, brawling, raging, outrageous, broiling, assaultive, tumultuous, intense, uproarious, vehement, violent, wild, fierce, furious, frenzied, abusive, savage

Usage examples:

• 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.