Impossible
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Literal Impossibility
Used to state something cannot happen due to laws of nature or limitations. Flying unaided like a bird is impossible for humans.
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Hyperbolic Expression
Often used to emphasize the difficulty of a task, not always literal. Climbing that mountain in a day seems impossible.
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Emphasize Futility
Indicates that effort will not change the outcome, suggesting giving up. Arguing with him is impossible; he never listens.