This man is very stiff [inflexible].

这个人好刻板。

《新英汉大辞典》

My shoulders are very stiff.

我的肩膀很僵硬。

youdao

He felt very stiff the day after his first weight training class.

在那天他的第一次举重训练课之后他感觉非常僵硬。

youdao

I don't know, a very English, sort of stiff upper lip kind of man.

我不知道，一个英国式的，坚定沉稳的男人。

皇室的绯闻 - SpeakingMax英语口语达人

"The entire body was very stiff, almost like a board, " Sanchez told jurors.

CNN: Andrea Yates case: Expert says children suffered 'slow death'

Apparently, a very stiff pay-for-performance relationship, paying people a near obscene amount of money if they succeed, actually makes them less likely to perform well.

FORBES: Flawed remuneration: Large bonuses can be counter-productive

Some Asian players are also very stiff or cold.

NEWYORKER: The Olympian