Short trousers are improper at a dance.

舞会上穿短裤不成体统。

《新英汉大辞典》

Laughing and joking are improper at a funeral.

葬礼时大笑和开玩笑是不合适的。

《新英汉大辞典》

Disputes between parents, breakdown of a family and improper ways of education can lead to adolescents forming negative personalities and even committing an offence.

父母冲突、破碎家庭、教育方法不当以及家庭环境影响都会导致青少年形成不良个性，甚至走上犯罪的道路。

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Kurdish opposition groups led by the "Goran", or Change block of Nusherwan Mustapha, issued a list of complaints about improper electoral procedures and numerous irregularities during Saturday's vote.

VOA: standard.2009.07.26

One of my colleagues suggested that he could head a defense contractor like Lockheed, but CEO-elect Christopher Kubasik, who was set to head the company in January, just resigned after a reported improper relationship with a female employee.

FORBES: David Petraeus: Everything You Need To Know About The Scandal

Babel admitted a charge of improper conduct at a Football Association Regulatory Commission hearing.

BBC: Liverpool's Ryan Babel fined ?10,000 for Twitter post

It is understood that Adebayor was at Wembley on Thursday to admit a charge of improper conduct to a Football Association regulatory commission hearing.

BBC: Fine & suspended ban for Adebayor