Marked by extreme and violent energy:
— Fierce fighting.
Marked by extreme intensity of emotions or convictions; inclined to react violently; fervid:
— Fierce loyalty.
Violently agitated and turbulent:
— The fierce thunders roar me their music.
Moby thesaurus: Draconian, Tartarean, abandoned, acid, acidulous, acrid, acrimonious, acute, aggressive, amok, angry, animal, antagonistic, anthropophagous, astringent, atrocious, awful, barbaric, barbarous, battling ... show more.
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