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