He is really bad at making decisions.

他的确不善于决策。

《牛津词典》

Some people are bad at recalling names and faces.

有些人不善于记名字和长相。

youdao

A review of the past year in disaster history suggests that modern Americans are particularly bad at protecting themselves from guaranteed threats.

回顾过去一年的灾难历史，我们发现现代美国人在保护自己免受威胁方面做得尤其糟糕。

youdao

An old ivy vine, going bad at the roots, climbed half way up the wall.

VOA: special.2009.08.01

69KJ/moL Somewhere here, 569 over here, kilojoules per mole, 608 and by his formula he gets 608, which isn't bad, which really isn't bad at all.

在这儿，通过这个公式他得到，或许这并不坏，一点都不坏。

麻省理工公开课 - 固态化学导论课程节选

Oh, this professor is very bad at teaching, he doesn't even teach on the topic or

哦，这个教授教得很不好，他教的内容根本不在点上，或者

课程评价网站 - SpeakingMax英语口语达人

We golfers, it turns out, are bad at assessing the state of our skills.

WSJ: The Wrong Way to Practice Golf | Golf Journal by John Paul Newport

But companies are notoriously bad at evaluating their stock price, and tend to badly mistime buybacks.

FORBES: BP: $8 Billion Share Buyback After TNK-BP Sale Suggests Stock Is Cheap. Is It?

In addition these models are especially bad at predicting sudden changes or tipping points.

FORBES: Why Skepticism About Computer Models Is Not A Good Reason For Skepticism About Climate Change