effrontery
/eˈfrʌntərɪ/noun
mass noun
- insolent or impertinent behaviour厚颜无耻的行为; 放肆：
one juror had the effrontery to challenge the coroner's decision.
一位陪审员竟无礼地对验尸官的结论提出了质疑。
词源
late 17th cent.: from French effronterie, based on late Latin effrons, effront- 'shameless, barefaced', from ex- 'out' + frons 'forehead'.