Temerity (noun)

Excessive boldness or recklessness; audacity.

Origin:

From latin temeritas, from temere "rashly".

Examples:

1. It took a lot of temerity to speak out against the dictator.
2. He had the temerity to question the authority of the police.
3. The temerity of the young climbers was admirable.
4. Her temerity in the face of danger was admirable.
5. His temerity in the face of failure was admirable.