Temerity
Part of speech: noun
Definition: Reckless boldness; foolish bravery. An act or case of reckless boldness. Effrontery; impudence.
Audacity
Part of speech: noun
Definition: Insolent boldness, especially when imprudent or unconventional.Fearless, intrepid daring.
Example sentence: Tact in audacity is knowing how far you can go without going too far.