hardihood (n.)

• assurance
• audacity
• birr
• boldness
• brashness
• brazenness
• cockiness
• disrespect
• fortitude
• go
• grit
• guts
• hardiness
• impertinence
• impudence
• intrepidity
• moxie
• nerve
• pep
• pluck
• potency
• sand
• tuck
• vigor