effrontery /ɪˈfrʌntəri/ noun Learner's definition of EFFRONTERY
[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.厚颜无耻的态度;鲁莽的举止