bang-bang, blood-and-guts, convulsive, cyclonic, explosive, ferocious, fierce, furious, hammer-and-tongs, hot, knock-down, drag-out(or knock-down-and-drag-out), paroxysmal, rabid, rough, stormy, tempestuous, tumultuous, violent, volcanic

barbarous, brutal, savage, viciousantagonistic, hostileaggressive, assertive, bellicose, belligerent, combative, contentious, gladiatorial, pugnacious, quarrelsome, truculentcombustible, volatileagitated, frantic, frenzied, madcataclysmal(or cataclysmic), destructive, ruinous

nonviolent, peaceable, peaceful

calm, halcyon, pacific, serene, tranquilnonbelligerent, unaggressive