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fierce(Ferocious), adjective battling, blustering, blustery, by force, clamorous, destructive, devastating, distracted, feral, fighting, frantic, frenzied, furious, gladiatorial, militant, possessed, rabid, raging, rampant, ranting, raving, ravished, rip-roaring, roaring, thunderous, torrential, truculent, turbulent, uncontrolled, unrestrained, warlike, warring
Associated concepts: fierce criticism, fierce debate, fierce fight
fierce(Intense), adjective abandoned, acute, aggressive, amok, angry, animal, animated, ardent, avid, awful, barbarous, bellowing, berserk, beside oneself, bestial, bloodthirsty, bloody, blue in the face, bold, brutal, brutish, carried away, cruel, dangerous, deep, delirious, demoniacal, demonic, desperate, distracted, eager, earnest, ecstatic, enraptured, enthusiastic, fanatical, fearsome, feral, fervent, fervid, fiery, frantic, frenzied, frightening, frothing, fulminating, furious, grim, haggard, hard, hearty, high-spirited, hog-wild, hostile, howling, impassioned, impetuous, in a transport or ecstasy, in hysterics, insane, intoxicated, irate, keen, mad, madding, malevolent, malign, maniac, maniacal, menacing, merciless, monstrous, mouth, murderous, orgasmic, orgiastic, out of one's wits, passionate, possessed, primitive, rabid, raging, ranting, ravening, raving, ravished, roaring, rough, running mad, ruthless, sanguinary, savage, sense, spirited, storming, terrible, tigerish, tough, transported, truculent, unbridled, unchecked, uncivilized, uncontrollable, uncurbed, unrestrained, untamed, venomous, violent, virulent, wild, wild-eyed, wrathful, zealous
See also: brutal, cruel, demonstrative, fervent, formidable, intense, severe, spartan, vehement, vicious