"Why don't you borrow your sister's car?" said Cassandra stiffly.

“为什么不借你姐姐的车？”卡珊德拉生硬地说道。

《柯林斯英汉双解大词典》

"She thinks we have lost the way," he replied stiffly, "and she is rather frightened."

“她以为我们迷路了，”他生硬地回答，“她相当害怕。”

youdao

Mary knew nothing about boys and she spoke to him a little stiffly because she felt rather shy.

玛丽对男孩子一无所知，她跟他说话时有点生硬，因为她觉得很害羞。

youdao

As bored-looking Bunnies stood stiffly against pounding hip-hop music, James was having trouble finding the happiness.

NEWYORKER: Happy Feet

So smokers should be assessed stiffly, even though they tend to be of lower income than nonsmokers.

FORBES: Who Voted For Those Taxes On Gays And Seniors?

Then I glanced over at the other Monica, the one sitting stiffly and very quietly on the couch.

NEWYORKER: Miracle Polish