Temerity
noun
Definition: Reckless, wild craziness: disregard for danger
Synonyms: gall, nerve, brass
Antonyms: hesitancy, graciousness, shyness
Sentences: The student had the temerity to tell her teacher that his answer were wrong.
The reckless boy drove the curving road temerity at a dangerous speed.
Cliff Jumping Hawaii - Proof