impossible Definition in the Cambridge English Dictionary
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Definition of “impossible” - English Dictionary

Definition of "impossible" - American English Dictionary

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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 ​rushhour is just impossible.
(Definition of impossible from the Cambridge Academic Content Dictionary © Cambridge University Press)

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 tosleep 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 ​extremelydifficult to ​deal with or ​solve: It's an impossible ​situation - she's got to ​leave him but she can't ​bearlosing her ​children.C2 An impossible ​personbehaves very ​badly or is ​extremelydifficult 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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