Sorry, no online dictionaries contain the exact phrase an impossible task.
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Reverse dictionary results:
1. sisyphean
2. futile endeavor
3. unattainable goal
4. quixotic challenge
5. herculetask
6. can
7. hard
8. rough
9. mission
10. quest
11. apagoge
12. atom
13. bay
14. blind spot
15. checkmate
16. contend
17. contending
18. contentment
19. conundrum
20. corner
21. cornering
22. cruise
23. defy
24. end
25. forbid
26. foreclose
27. forestalling
28. frozen
29. get
30. good
31. handicap
32. helpless
33. hopeless
34. iii
35. illimitable
36. immovable
37. imperative
38. imponderable
39. impossibility
40. impracticable

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