1.Definition: disposed to venture or take risks

"Audacious visions of the total conquest of space", "An audacious interpretation of two Jacobean dramas"

Related Adjective(s):daring, venturesome, venturous

2.Definition: invulnerable to fear or intimidation

"Audacious explorers"

Related Adjective(s):brave, dauntless, fearless, hardy, intrepid, unfearing

3.Definition: unrestrained by convention or propriety

"An audacious trick to pull"

Related Adjective(s):barefaced, bodacious, brassy, brazen, insolent