impossible Definition in Cambridge British English Dictionary
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Definition of "impossible" - British English Dictionary

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impossibleadjective

uk   /ɪmˈpɒs.ɪ.bl̩/  us   /-ˈpɑː.sə-/
B1 If an action or event is impossible, it cannot happen or be achieved: It was impossible to sleep because of the noise. It seems impossible that I could have walked by without noticing her. He made it impossible for me to say no. She ate three plates of spaghetti and a dessert? That's impossible. I don't believe it!C2 An impossilble situation is extremely difficult to deal with or solve: It's an impossible situation - she's got to leave him but she can't bear losing her children.C2 An impossible person behaves very badly or is extremely difficult to deal with: I had to leave the job because my boss was impossible. My niece is impossible when she's tired - you can't do anything to please her.
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impossibility
noun [C or U] uk   /ɪmˌpɒs.ɪˈbɪl.ɪ.ti/  us   /-ˌpɑː.səˈbɪl.ə.t̬i/
C2 What you're asking just can't be done - it's an impossibility.

impossiblenoun [S]

uk   /ɪmˈpɒs.ɪ.bl̩/  us   /-ˈpɑː.sə-/
the impossible something that cannot be expected to happen or exist: She wants a man who is attractive and funny as well, which is asking the impossible in my opinion.
(Definition of impossible from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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