If you describe a person or their behaviour as brazen, you mean that they are very bold and do not care what other people think about them or their behaviour.
例句
They're quite brazen about their bisexuality, it doesn't worry them.他們在自己的雙性戀問題上無所顧忌，毫不為意。
英漢詞典釋義
adv.
厚臉皮地；肆無忌憚地
How dare he distort the facts so brazenly!他怎么敢如此肆無忌憚地歪曲事實！