Audacity (noun): 1. Willingness to take risks; 2. Nerve
Audacity means two things: 1. Willingness to take risks and 2. Nerve.
For definition #1, here is a sentence: “Ethan’s audacity went to good use when nobody else was willing to climb onto the roof to retrieve the ball.” Here is the sentence for definition #2: “Laurel had the audacity to tell Grace she was not a good runner when she came in last.”
Synonyms for definition #1 are: bravery, courage, fearlessness, and intrepidity.
Synonyms for definition #2 are: gall, impudence, inconsideration, and temerity.