adjective

1. Exceedingly violent, severe, ferocious, cruel or savage.

   “A fierce storm battered the coast.”

2. Resolute or strenuously active.

   “We made a fierce attempt to escape.”

3. Threatening in appearance or demeanor.

   “The lion gave a fierce roar.”

Synonyms: incessive, incessive

adverb

1. (rural) Extremely; very.

   “It was fierce cold last night.”