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The temerity of his driving probably led to the car crash that killed him.
Temerity is reckless boldless, or foolish bravery.
The student had the temerity to tell her professor that his conclusions were wrong.
With the temerity of youth, the teen drove the curving road at a dangerous speed.
The redoubtable US Marines are renown for their temerity and boldness .
recklessness.