violent

barbarous, brutal, savage, vicious

antagonistic, hostile

aggressive, assertive, bellicose, belligerent, combative, contentious, gladiatorial, pugnacious, quarrelsome, truculent

combustible, volatile

agitated, frantic, frenzied, mad

cataclysmal (or cataclysmic), destructive, ruinous

accentuated, aggravated, concentrated, deepened

emphasized, enhanced, heightened, intensified, magnified

stressed

exhaustive, thorough

harsh, rigorous, severe

concentrated, high-pressured, intense, intensive, vehement

excessive, exorbitant, extravagant, extreme, immoderate, inordinate, lavish, overmuch, overweening, unconscionable, undue

crazed, crazy, demented, deranged, insane, irrational, lunatic, mad, maniacal (also maniac)

decided, insistent, marked, pointed

absolute, categorical (also categoric), clear, plain, unambiguous, unequivocal

arresting, compelling, conspicuous, impelling, noticeable, striking