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》

"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