1. Invulnerable to fear or intimidation
   "audacious explorers"
   - brave, dauntless, fearless, hardy, intrepid, unfearing 
2. Unrestrained by convention or propriety
   "an audacious trick to pull"
   - barefaced, bodacious [N. Amer], bald-faced, brassy, brazen, brazen-faced, insolent 
3. Disposed to venture or take risks
   "audacious visions of the total conquest of space"; "an audacious interpretation of two Jacobean dramas"
   - daring, venturesome, venturous

See also: adventuresome, adventurous, audaciously, audacity, bold, unashamed

Encyclopedia: Audacious

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