It is impossible here.
E. M. Forster, A Passage to India
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Dictionary
Merriam-Webster
— incapable of being or of occurring
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Macmillan
— if something is impossible, no one can do it or it cannot happen
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Collins
— Something that is impossible cannot be done or cannot happen.
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Usage
12 uses of ‘impossible’ in A Passage to India, by E. M. Forster