audacious
形容词 audacious:
invulnerable to fear or intimidation
同义词:brave, dauntless, fearless, intrepid, unfearing
unrestrained by convention or propriety- Bertrand Russell
同义词:barefaced, bodacious, bald-faced, brassy, brazen, brazen-faced, insolent
disposed to venture or take risks
同义词:daring, venturesome, venturous