Learn That Word

Synonyms for Boldness (same or very similar meaning)

WordNet sense 1 (the trait of being willing to undertake things that involve risk or danger):
daring, hardihood, hardiness

WordNet sense 2 (impudent aggressiveness):
brass, cheek, face, nerve

WordNet sense 3 (the quality of standing out strongly and distinctly):

From the ODE community, based on WordNetadd/edit