Synonyms for Daredevil (same or very similar meaning)
WordNet sense 1 (a reckless impetuous irresponsible person):
harum-scarum, hothead, lunatic, madcap, swashbucklerWordNet sense 2 (presumptuously daring):
temerariousWordNet sense 3 (fearless and daring):
boldFrom the ODE community, based on WordNetadd/edit