Sorry, no online dictionaries contain the exact phrase impossible to undo.
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Reverse dictionary results:
1. irreversible
 2. irrevocable
3. permanent
4. unchangeable
5. final
6. changeless
7. cut and dried
8. endlessly
9. fixed
10. illimitable
 11. imperishable
12. indefinitely
13. indissociably
14. interminable
15. no end
16. all-time
17. endless
18. impossible
19. incomparable
20. indelible
 21. indeterminate
22. infinite
23. interminate
24. irrefragably
25. uncompanioned
26. unending
27. unexceeded
28. unexcelled
29. unfadingly
30. unmatched
 31. unmistakable
32. world record
33. atemporal
34. bar none
35. bottomless
36. calcified
37. continuous
38. exhaustless
39. forget it
40. graspless

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You can look up the words in the phrase individually using these links:   impossible ?   to ?   undo ?
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