不严肃的

例句：

1. 1. He was so indifferent to the news that he didn't even bother to read it.
   他对新闻漠不关心，甚至没有去读。
2. 2.The teacher was indifferent to the students' questions, not answering them.
   老师对学生们的问题漠不关心，没有回答。
3. 3. The company's CEO was indifferent to the employees' concerns, not addressing them.
   公司的CEO对员工们的关注漠不关心，没有回应。