以下是一些表達失望的英文句子：
You never feel my lonliness.（你從未體會過我的孤單）
Why did you know that the flowers are withered before you come back to water them?（為什麼花都枯萎了才知道回來澆水呢）
Not getting the job was a terrible disappointment.（得不到那份工作，叫人失望極了）
If only I had a better job.（我希望能找到更好的工作）
I wish I had more time for my family.（我希望自己能有更多的時間陪伴家人）
I wish they asked me more questions. I'm sure I could be of more help.（我希望他們能多問些問題。我就一定能給予他們更多幫助）
Let sb down表面上看是「把某人放倒」，其實這裡不是說人，而是人的心情，意思是令人失望。例：I'm relying on your help - please don't let me down.（我就靠你了——別讓我失望）
DejectedRejected表示「被拒絕」，dejected則指的是「沮喪」、「灰心」。例：She looked a bit dejected when they told her she didn't get the job.（當她知道未能得到那份工作時，她臉上露出一絲失望的表情）
fail這個詞的英文解釋是： If someone fails you, they do not do what you had expected or trusted them to do.你可以理解為「使……失望」，也可以理解為「辜負」。例：We waited twenty-one years, don't fail us now.（我們等了21年，如今不要辜負我們）