They would be ill-advised to do this.

他们这么做是不明智的。

《柯林斯英汉双解大词典》

What he means is that we are ill because we do not cultivate what we are about enough.

他是说，我们正在生病，是因为我们没有尽力做好我们本该做到的事。

youdao

I told her that my father was ill but he asked me to do this.

我告诉她我父亲病了，但他让我这么做。

youdao

With Europe's unemployment now falling, and its people increasingly sniffy about the sorts of jobs they are prepared to do, or too ill-equipped to do the high-tech ones being created, the continent's workforce is in need of renewal as never before.

ECONOMIST: Europe needs more immigrants

But they are ill-equipped to do much to stop further warfare.

ECONOMIST: Congo��s hidden war

It is ill-equipped to do so.

ECONOMIST: Iraq and the Pentagon