I treated him as a convalescent, not as a sick man.

我把他当作正在康复的人，而不是病人。

《牛津词典》

The life of the sick man is at stake.

病人的生命在危急中。

《新英汉大辞典》

He was a sick man.

他是个病人。

youdao

He now was sixty-eight years old and a sick man.

VOA: special.2009.03.26

These are to bury the old man deep in the ground, and to bring religion to his uncle's mentally sick child.

VOA: special.2010.12.26

And Everett smiled back at the sick old man.

VOA: special.2009.03.07

YCharts Pro says OfficeMax, widely considered the sick man of the three, is overpriced.

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In the past two decades Italy has unquestionably become the sick man of Europe.

ECONOMIST: The return of Silvio Berlusconi

This process was dubbed "stop-go, " and left Britain the sick man of Europe.

FORBES: How It Went Wrong--And How to Make It Right