我们躺在软软的干草铺上，对小茅屋的主人有说不尽的感激。

We were lying on bed, feeling endlessly grateful to the owner of the house.

youdao

她说：“这样可以叫他精神痛快些，我对你真是说不尽的感激。”

"It keeps him in good humour," said she, "and I am more obliged to you than I can express."

youdao

如果有人对我的工作提出意见我将感激不尽。

I'd appreciate some feedback on my work.

《牛津词典》