Synonyms and related words :
abrupt, accident-prone, breakneck, breathless, careless, desperate, devil-may-care, electrifying, furious, harum-scarum, hasty, headlong, hotheaded, hurried, impetuous, impulsive, mad, nerve-shattering, overeager, overenthusiastic, overzealous, panting, precipitate, precipitous, quick, rash, reckless, rushing, shocking, slap-bang, slapdash, speedy, startling, sudden, surprising, swift, unanticipated, unexpected, unforeseen, unlooked-for, unpredicted, wanton, wild