Synonyms for fierce

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1. Said especially of people and animals

   ferocious, wild, savage, furious, enraged, raging, impetuous, untamed, angry, passionate, primitive, uncivilized, brutish, feral, animal, raving, terrible, frightening, fearsome, menacing, awful, venomous, bold, malevolent, malign, brutal, cruel, merciless, ruthless, bloodthirsty, bloody, murderous, sanguinary, truculent, aggressive, hostile, violent, monstrous, rough, grim, vicious, dangerous, frenzied, mad, insane, desperate, ravening, frantic, wrathful, irate, rabid, virulent, fanatical, bestial, tigerish, barbarous, hard*, tough*, hard-boiled*; see also sense 2.

   Antonyms gentle*, tame, peaceful*.

2. Said especially of actions and the weather

   boisterous, violent, vehement, threatening, severe, stormy, thunderous, howling, inclement, tumultuous, turbulent, uncontrolled, unbridled, unrestrained, raging, storming, blustering, cyclonic, blizzardy, torrential, of hurricane force, frightful, fearful, lowering, destructive, devastating, hellish, rip-roaring*; see also sense 1.

   Antonyms mild*, moderate, calm.

3. Intense

   ardent, fervent, deep, acute; see intense.