noun (n)

• the trait of being willing to undertake things that involve risk or danger(noun.attribute)

  Synonym:
  boldness, daring, hardiness
  Antonym:
  timidity, timorousness
  

  source: wordnet30
• Boldness, united with firmness and constancy of mind; bravery; intrepidity; also, audaciousness; impudence.(noun)

  source: webster1913