Sorry, no online dictionaries contain the exact phrase opposite of ensure.
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Reverse dictionary results:
1. box
2. for
3. nox
4. pass
5. print
6. register
7. sweet
8. ice
9. more
10. yell
11. undercut
12. acknowledgment
13. anything
14. application
15. apply
16. assure
17. calibrate
18. calibrated
19. check
20. deliver
21. doom
22. guarantee
23. guard
24. implement
25. implemented
26. insure
27. magnesium
28. maintain
29. make
30. making
31. mind
32. part
33. precaution
34. protect
35. protection
36. provide
37. providing
38. reseed
39. respect
40. responsibility

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You can look up the words in the phrase individually using these links:   opposite ?   of ?   ensure ?
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