noun (n)

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

  Example:
  The proposal required great boldness.
  

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

  source: wordnet30
• impudent aggressiveness(noun.attribute)

  Example:
  I couldn't believe her boldness.
  

  Synonym:
  brass, cheek, face, nerve
  

  source: wordnet30
• the quality of standing out strongly and distinctly(noun.attribute)

  Synonym:
  strikingness
  

  source: wordnet30
• The state or quality of being bold.(noun)

  source: webster1913