她的话消失在九霄云外。

Her words disappeared into the ether.

《牛津词典》

我不希望他要求我说出他的名字，因为我将他的名字早已抛到九霄云外了。

I hope he doesn't ask me to say his name because I already forgot it.

youdao

我对自己发誓下个月我会做好一点，并对这个模糊的目标感到满意，接着就把它抛到九霄云外去了。

I'd swear to myself to do better next month, and satisfied with that vague goal, put the whole thing out of my mind.

youdao