fiercely          
adverb uk/ˈfɪəs.li/ us/ˈfɪrs.li/
 凶猛地;激烈地;猛烈地
in a frightening, violent, or powerful way
  to growl/fight fiercely 凶猛地咆哮/激烈地搏斗 
 to burn fiercely 猛烈地燃烧 
  极其
extremely
  She's fiercely competitive/independent. 她极具竞争力/极其独立。