By that time I had lost (all) interest in the idea.

那时我已经对此想法（完全）失去兴趣了。

《牛津词典》

For the first time in my life I was lost in another world.

我有生以来第一次迷失在另一个世界。

youdao

"I never thought the time was lost," he said later.

他后来说，“我从不认为这段时间是白白浪费的。”

youdao

Another time,I was running along. Somebody who'd lost all his moneyin the T-shirt business, he wanted to put my faceon a T-shirt, but he couldn't draw that well, and he didn't have a camera.

VOA: standard.other

I think you'd get lost pretty much all the time.

你会经常迷路。

友好的英国人 - SpeakingMax英语口语达人

Though I had been blessed with consistent work, I lost my health insurance for the first time when I found myself undergoing my first major knee surgery five years ago.

FORBES: I Work Three Jobs and Still Can't Afford Health Insurance

At the time, I assumed that it had just gotten lost in the shuffle and that it would eventually re-surface, perhaps when school started again in August.

FORBES: How Long are Undeposited Checks Good?

Not surprisingly, by the time I was done crunching all the numbers, my daughter had completely lost interest in the whole experiment.

WSJ: Obstacles for Young Investors