Nouns

(n)savage, barbariana member of an uncivilized people
(n)beast, wolf, savage, brute, wildcata cruelly rapacious person

Verbs

(v)savageattack brutally and fiercely
(v)savage, blast, pillory, crucifycriticize harshly or violently“The press savaged the new President”, “The critics crucified the author for plagiarizing a famous passage”

Adjectives

(s)barbarous, brutal, cruel, fell, roughshod, savage, vicious(of persons or their actions) able or disposed to inflict pain or suffering“a barbarous crime”, “brutal beatings”, “cruel tortures”, “Stalin's roughshod treatment of the kulaks”, “a savage slap”, “vicious kicks”
(s)feral, ferine, savagewild and menacing“a pack of feral dogs”
(s)barbarian, barbaric, savage, uncivilized, uncivilised, wildwithout civilizing influences“barbarian invaders”, “barbaric practices”, “a savage people”, “fighting is crude and uncivilized especially if the weapons are efficient” (Margaret Meade), “wild tribes”
(s)ferocious, fierce, furious, savagemarked by extreme and violent energy“a ferocious beating”, “fierce fighting”, “a furious battle”