ef·fron·tery 
/ɪˈfrʌntəri/ noun
/ɪˈfrʌntəri/ noun [noncount] formal : a very confident attitude or way of behaving that is shocking or rude : nerve ◊Effrontery describes the attitude of a person who does something very boldly and without shame even though it is wrong or offensive in some way.
▪ He had the effrontery to deny doing something that we saw him do.
▪ He had the effrontery to deny doing something that we saw him do.
