淡然用英语可以说作 nonchalance。它来源于法语，原意为“冷静，淡定”。例如：

He greeted the news with nonchalance, as if he had expected it all along. (他对这个消息淡然处之，仿佛早就料到会这样。)

She answered the question with nonchalance, as if it was no big deal. (她淡然地回答了这个问题，仿佛这并不是什么大事。)

希望这些例句能对你有帮助。