Exceedingly violent, severe, ferocious, cruel or savage.
A fierce storm battered the coast.
Resolute or strenuously active.
We made a fierce attempt to escape.
Threatening in appearance or demeanor.
The lion gave a fierce roar.
(rural) Excellent, very good.
Q: "How was the party last night?" A: "Fierce!"
Of exceptional quality, exhibiting boldness or chutzpah.
Tyra said to strike a pose and make it fierce.
(rural) Extremely; very.
It was fierce cold last night.