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Synonyms for Brute (same or very similar meaning)

WordNet sense 1 (a cruelly rapacious person):
beast, savage, wildcat, wolf

WordNet sense 2 (resembling a beast; showing lack of human sensibility):
beastly, bestial, brutish

WordNet sense 3 (lacking and reflecting lack of pity or compassion):

WordNet sense 4 (a living organism characterized by voluntary movement):
animal, creature, fauna, animate being

From the ODE community, based on WordNetadd/edit