I think it was really bad luck.

我认为运气真是糟透了。

youdao

To concede a goal in the last minute is really bad luck.

但要承认，在最后一分钟失球确实运气不佳。

youdao

Amanda: My goldfish just died. I think that must be really bad luck!

阿曼达：我的金鱼刚刚死了。我想我的运气真的糟透了。

youdao

I have really bad luck.

我最近太背了。

I can't 实战 - SpeakingMax英语口语达人

Or, to put it another way, what really killed the dinosaurs was a string of the most atrocious bad luck.

ECONOMIST: Mass extinctions