Webster's English Dictionary

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audacious

au.da.cious \o.-'da--sh*s\ aj [MF audacieux, fr. audace boldness, fr. L 
   audacia, fr. aud]ac-, audax bold, fr. aude-re to dare, fr. avidus eager - 
   more at AVID 1a: intrepidly daring : ADVENTUROUS  1b: recklessly bold : 
   RASH  2: contemptuous of law, religion, or decorum : INSOLENT  3: marked by 
   audacity  - au.da.cious.ly av