“不可能”的英文翻译是：impossible
impossible [ɪm'pɒsɪb(ə)l]
adj. 不可能的；不可能存在的；难以忍受的；不真实的。
n. 不可能；不可能的事。
例句：
Excessive rainfall had made the harvest impossible.
Apparently impossible feats are now accomplished by science.
It's almost impossible to find him in the immense ocean.
Absolutely impossible!
That's quite impossible, I'm afraid.