boldness or recklessness (audacity), excessive willingness or confidence to do something despite opposition or danger, often in a foolish or unreasonable way;
e.g. He was the only one with the temerity to interrupt the speaker.
(noun)
an instance of someone being overly bold or reckless, a rash or audacious action;
e.g. We were shocked at her temerity and were certain she would face consequences for it.