Synonyms of 'breakneck'

abrupt, accident-prone, agile, bluff, bold, breathless, careless, dangerous, daredevil, dashing, desperate, devil-may-care, excessive, expeditious, express, fast, fleet, flying, furious, galloping, hair-trigger, harum-scarum, hasty, headlong, hotheaded, hurried, impetuous, impulsive, light-footed, lively, mad, mercurial, nimble, overeager, overzealous, precipitant, precipitate, precipitous, prompt, quick, rapid, rash, reckless, running, sharp, sheer, slap-bang, slapdash, snappy, spanking, speedy, steep, sudden, swift, vertical, wanton, wild, winged