I think black cats are good luck, not bad luck.

我觉得黑猫代表好运而不是不幸。

youdao

In the journey of life, the worst of circumstances is often not poverty, not bad luck, but the spirit and mood is in a state of exhaustion of ignorance without sleep.

在人生的旅途中，最糟糕的境遇往往不是贫困、不是厄运，而是精神和心境处于一种无知无觉的疲惫状态。

youdao

What bad luck! He's not at home.

真不凑巧！他出去了。

《新英汉大辞典》

India has not been alone in watching bad luck and unfortunate timing undo its hopes.

CNN: WHY VISIT THIS YEAR?

But he might have stayed longer were it not for a mix of bad luck and overconfidence.

ECONOMIST: Thomson Reuters: Screen test | The

"The passage of the disease through the market was not a reflection on them but was simply bad luck, " he said.

BBC: Show doubt as outbreaks reach 20