Adjectives

(s)ferocious, fierce, furious, savagemarked by extreme and violent energy“a ferocious beating”, “fierce fighting”, “a furious battle”
(s)fierce, tearing, vehement, violent, trigger-happymarked by extreme intensity of emotions or convictions; inclined to react violently; fervid“fierce loyalty”, “in a tearing rage”, “vehement dislike”, “violent passions”
(s)cutthroat, fierce, bowellessruthless in competition“cutthroat competition”, “bowelless readiness to take advantage”
(s)boisterous, fierce, roughviolently agitated and turbulent“boisterous winds and waves”, “the fierce thunders roar me their music” (Ezra Pound), “rough weather”, “rough seas”