frustrated

adj.失败的,落空的

感到沮丧；感到受挫；感到失望

形容词

1、I feel frustrated with my lack of progress in learning a new language.
我对于学习一门新语言的进展缺乏满意感到沮丧。

2、She became frustrated when her computer crashed and she lost all her work.
当她的电脑崩溃并且失去了所有工作时，她感到非常失望。