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。
And it wasn't because I had lost interest in it.
这并不是因为我对它不感兴趣了。
I have not lost interest in other people.
我对别人并没有失去兴趣。
I have lost my interest in chemistry.
我对化学已不感兴趣。
I have lost interest in my work.
我已经对我的工作失去了兴趣。
I have lost interest in my work.
我已经对我的工作失去了兴趣。
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