adj.垂头丧气的;气馁的
The youth looked exceedingly crestfallen. 那青年看上去垂头丧气极了。
He looked a little crestfallen (or depressed). 他看起来有点灰溜溜的样子。
What happened? You look so crestfallen like it's the end of the world! 怎麽了?你看起来垂头丧气的,好像世界末日一样。