What is the meaning of fierce?

adjective

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