Impossible的意思需要我们分情况对待，
当impossible形容事物时，
它通常表示的是不可能的，
但是当它形容人的时候，
那意思就变了
someone who is impossible behaves in a way that is unreasonable and annoying
某人是impossible，那么就是说这个人的行为有点不合理且令人讨厌
It means that the other person is being incredibly stubborn or foolish, choosing some stance or action that's absurd. Could also be an expression of frustration about someone, like if some guy's cat keeps taking a dump outside the litter box, he might call the cat impossible.
它指那个人非常顽固或愚蠢，选择了一些荒谬的立场或行为。也可以用来表达对某人的不满，比如某人的猫一直在猫砂盆外面拉屎，他可能会说这只猫impossible（不可理喻）。
“
例：
Young children are impossible at times.
岁数小的孩子有时候真让人受不了。
My niece is impossible when she's tired - you can't do anything to please her.
我侄女累的时候很难相处——你做什么也无法使她高兴。
the impossible
“the impossible”的意思是something that is impossible or very difficult to do（不可能或很难做的事）
例：
She wants a man who is attractive and funny as well, which is asking the impossible in my opinion.
她想找一个有魅力又风趣的男人，这在我看来是不可能的事。
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