他对传统习俗的不敬言论让长辈们感到不安。

His ___irreverent comments about traditional customs upset the elders.

他在教堂里开的不合时宜的玩笑被认为是对宗教的不敬。

His ___irreverent jokes in the church were considered disrespectful to religion.

他那种玩世不恭的态度让严肃的会议变得轻松起来。

His ___irreverent attitude lightened up the serious meeting.