Sorry, no online dictionaries contain the exact phrase opposite of assure.
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Reverse dictionary results:
1. doubt
2. uncertainty
3. disbelieve
4. question
5. hesitate
6. aporetic
7. doubtful
8. misdoubt
9. mistrustful
10. problematical
11. questioning
12. reasonable doubt
13. short
14. skeptical
15. suspect
16. suspectful
17. suspection
18. suspensory
19. suspicional
20. suspicious
21. suspiciously
22. aporetical
23. doobt
24. doubtable
25. doubtance
26. doubter
27. dubersome
28. dubiety
29. dubiosity
30. dubious
31. dubiousness
32. dubitate
33. dubitation
34. dubitative
35. fishy
36. hank
37. in question
38. incredulity

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