fierce

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

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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

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See also: brutal, cruel, demonstrative, fervent, formidable, intense, severe, spartan, vehement, vicious