effrontery

/ɪˈfrʌntəri/
noun
  1. Shameless or rude behavior that shows a lack of respect, especially when someone does something bold or impolite that they should be embarrassed about.
    • The politician's effrontery in lying to the public about the scandal shocked even his supporters.
    • She had the effrontery to tell the teacher that the assignment was a waste of time.
    • He showed incredible effrontery by cutting in line and acting like he belonged there.
Antonyms