愉快的相反當然就是不愉快，通常在單字前面加上 un 來表達，例如 unhappy 或 unpleasant 都可以，讓人感覺不愉快的情況英文可以說 unpleasant situation。
愉快英文造句練習
This meeting is a very pleasant experience.這次的見面是一個很愉快的經驗。
Getting along with Mary will make people feel very happy.
跟瑪莉相處會讓人感覺非常愉快。
The couple looks very unhappy.
這對情侶看起來似乎很不愉快。
There are many unpleasant things between Mary and his husband.
瑪莉與他的老公之間有許多不愉快的事情。
If you are unhappy with a person every time, then you should stay away from him.
如果你每次與一個人相處都不愉快，那你應該遠離他。
I was very happy to be able to attend this event.
能參加這次的活動讓我感覺非常愉快。
The song makes people feel happy.
這首歌讓人感覺心情愉快。
Please keep a happy mood.
請保持愉快的心情。
Matt seems to be very happy every day.
麥特似乎每天都非常愉快。
Having a huge fortune does not necessarily make you feel happy.
擁有龐大的財富不一定能讓你感到愉快。