youdao

It is bad manners to talk with your mouth full.

嘴里塞满了东西跟人说话是不礼貌的。

《牛津词典》

Many visitors complained of his bad manners and self-importance.

许多访客抱怨他的不礼貌和妄自尊大。

《柯林斯英汉双解大词典》

Under the stifling, consensus-based post-war system, based on a Social Democrat-People's Party duopoly, mentioning the issue smacked of bad manners.

BBC: Gross symbolises Austria's past

Salahaddin kept smiling, and my grogginess started to feel like bad manners.

BBC: My unexpected trip to a Libyan hospital

Another dirty comedy of bad manners from director Neil LaBute.

NEWYORKER: Your Friends & Neighbors