facetious

1. ADJ If you say that someone is being facetious, you are criticizing them because they are making humorous remarks or saying things that they do not mean in a situation where they ought to be serious. (在不当的场合)开玩笑的; 滑稽的; 轻浮的[表不满]

The woman eyed him coldly. "Don't be facetious," she said. 那妇人冷冷地看了他一眼。“别那么轻浮，”她说道。