Meaning of “impossible” in the English Dictionary

"impossible" in British English

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impossibleadjective

uk /ɪmˈpɒs.ə.bəl/ us /ɪmˈpɑː.sə.bəl/

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 impossible 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.əˈbɪl.ə.ti/ us /ɪmˌpɑː.səˈbɪl.ə.t̬i/

C2

What you're asking just can't be done - it's an impossibility.

impossiblenoun [ S ]

uk /ɪmˈpɒs.ə.bəl/ us /ɪmˈpɑː.sə.bəl/

(Definition of “impossible” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"impossible" in American English

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impossibleadjective

us /ɪmˈpɑs·ə·bəl/

impossible adjective (NOT POSSIBLE)

[ not gradable ] unable to exist, happen, or be achieved; not possible:

an impossible goal
[ + to infinitive ] It’s almost impossible to get them to agree on anything.

impossible adjective (VERY DIFFICULT)

very difficult to deal with:

Traffic at rush hour is just impossible.

(Definition of “impossible” from the Cambridge Academic Content Dictionary © Cambridge University Press)