impossible /ɪmˈpɒsəbl/ adjective
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.