He was a shy, sometimes unhappy man.

他是一个害羞、有时不快乐的人。

《柯林斯英汉双解大词典》

I'm a double character girl who is sometimes happy sometimes unhappy.

一个有时开心，有时忧郁的双重性格的女生。

youdao

Miss Hayes enjoys working for a newspaper but she sometimes gets unhappy about all the crime she has to report.

海耶斯小姐喜欢在一家报社工作，但是她有时会对她所需要报道的那些犯罪行为感到不高兴。

youdao

"If you do what I do you are going to end up making people sometimes happy and sometimes unhappy, " he says.

FORBES: Smart Collecting

Sometimes she is unhappy, and then she will tell us, I am dying.

NEWYORKER: Magda Mandela

Denton sometimes encounters people who are unhappy with what he is doing.

NEWYORKER: Search and Destroy