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impossible

 
 
/ɪmˈpɒsəbl/ adjective

Definition

CANNOT HAPPEN If an action or event is impossible, it cannot happen or be done: an impossible task He finds walking almost impossible. [+ to do sth] It was impossible to sleep because of the noise.
DIFFICULT very difficult to deal with: You just can't reason with her, she's absolutely impossible. You're putting me in an impossible position.
impossibility
 
 
/ɪmˌpɒsəˈbɪləti/ noun [C, U]
when something is impossible: [usually singular] I can't do it - it's a physical impossibility.
(Definition of impossible adjective from the Cambridge Learner's Dictionary © Cambridge University Press)

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