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Adjective: fierce (fiercer,fiercest)  feers
  1. Marked by extreme and violent energy
    "fierce fighting";
    - ferocious, furious, savage
  2. Marked by extreme intensity of emotions or convictions; inclined to react violently; fervid
    "fierce loyalty";
    - tearing, vehement, violent, trigger-happy
  3. Ruthless in competition
    "fierce competition";
    - cutthroat, bowelless
  4. Violently agitated and turbulent
    "the fierce thunders roar me their music";
    - boisterous, rough

Derived forms: fiercest, fiercer

See also: intense, merciless, procellous [archaic], stormy, unmerciful, violent

Encyclopedia: Fierce, Isakowitz & Blalock