1. menacingly wild, savage, or hostile: fierce animals; a fierce look.
2. violent in force, intensity, etc.: fierce winds.
3. furiously eager or intense: fierce competition.
4. Informal. extremely bad or severe: a fierce cold.
"voices can be fiercely."
"environments can be fiercely."
"children can be fiercely."
This list can help you learn new vocabulary more quickly and be able explore other words more easily.