not serious about a serious subject , in an attempt to be funny or to appear clever
发音
例句
1. He was so facetious that he turned everything into a joke. 他好开玩笑,把一切都变成了戏谑。 2. I became angry with the little boy at his facetious remarks. 我对这个小男孩过分的玩笑变得发火了。