失望的英文名詞用法是 despair（聽發音）或 disappointment（聽發音），中文也翻譯為絕望，例如 in despair 就是指一個人正在失望或絕望的情緒中。
失望英文造句練習
I am disappointed with this product.我對這項產品感到失望。
People should not live in despair.
人不應該活在失望裡。
People will inevitably be disappointed.
人難免會失望。
There is a saying: "The higher the expectations, the higher the disappointment."
有一句說：「期望越高、失望就越高。」
Mary was disappointed with this time exam.
瑪莉對這次的考試結果很失望。
No matter how the results of the competition will not be disappointed, at least you work very hard in the process.
無論比賽結果如何都不要失望，至少你在過程中非常努力。
Feeling disappointment is a human instinct.
感到失望是人類的一種本能。
The car's price is too high, so that consumers feel disappointed.
這款新車的價格實在太高，讓消費者感到失望。
Mike's mother was disappointed because Mike was not going to college.
麥克的媽媽感到很失望，因為麥克並不打算念大學。
Instead of wasting time to disappoint, we should planned again.
與其浪費時間去失望，我們應該重新計畫。
This restaurant is not open today, it is disappointing.
這家餐廳今天沒有營業，真令人失望。
Often disappointed is not a good thing.
經常失望不是一種好現象。
If you can, try not to do something that will make yourself disappointed.
如果你可以，盡量不要做會讓自己失望的事情。
As the performance did not reach, Clark was quite disappointed.
由於業績沒有達到，克拉克感到相當失望。
This game is very important, we will not let the coach disappointed.
這次的比賽非常重要，我們不會讓教練失望。
If you do not have the project done, the boss will be very disappointed.
如果你們沒有把專案完成，老闆將會感到非常失望。
Disappointment is a negative emotion.
失望是一種負面情緒。
We should hug hope and reduce disappointment.
我們應該擁抱希望，減少失望。