"fiercer" in the adjective sense
1. ferocious, fierce, furious, savage
marked by extreme and violent energy
"a ferocious beating"
"fierce fighting"
"a furious battle"
2. 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"
3. cutthroat, fierce, bowelless
ruthless in competition
"cutthroat competition"
"bowelless readiness to take advantage"
4. boisterous, fierce, rough
violently agitated and turbulent
"boisterous winds and waves"
"the fierce thunders roar me their music"- Ezra Pound
"rough weather"
"rough seas"
Source: WordNet® (An amazing lexical database of English)
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