fierce

adj

1.
marked by extreme and violent energy
ferocious furious savage
Derived from:
fierceness
2.
marked by extreme intensity of emotions or convictions; inclined to react violently; fervid
tearing trigger-happy vehement violent
Derived from:
fierceness
3.
ruthless in competition
bowelless cutthroat
Derived from:
fierceness
4.
violently agitated and turbulent
boisterous rough
Derived from:
fierceness