Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: French
Origin: audacieux, from audace 'audacity', from Latin audax 'brave', from audere 'to dare'

audacious

 adjective
     
au‧da‧cious
showing great courage or confidence in a way that is impressive or slightly shocking:
the risks involved in such an audacious operation
—audaciously adverb
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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