crestfallen
/ˈkrestˌfɔːlən/adjective
- sad and disappointed失望的, 沮丧的, 垂头丧气的：
he came back empty-handed and crestfallen.
他两手空空, 垂头丧气地回来了。
词源
late 16th cent.:figuratively, from the original use referring to a mammal or bird having a fallen or drooping crest.