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in a manner that is extremely difficult or unlikely to happen
- Running a marathon without training is impossibly challenging.
- Solving the complex puzzle without any hints seems impossibly difficult.
- Her dream of becoming an astronaut may feel impossibly distant, but she's determined.
- Balancing on a tightrope without a safety net is impossibly risky.
- Creating a masterpiece overnight is an impossibly high expectation for any artist.
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