Sorry, no online dictionaries contain the exact phrase not supposed to happen.
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Reverse dictionary results:
1. impossible
 2. unexpected
3. unforeseen
4. unanticipated
5. anomalous
6. ill-founded
7. illegitimate
8. immanifest
9. improbable
10. inarticulate
 11. invisible
12. latent
13. nonconstructive
14. nonevent
15. rumored
16. silent
17. unapparent
18. unapproved
19. uncommunicative
20. unconsidered
 21. undiscerned
22. unexpectable
23. unexplained
24. unforthcoming
25. unheeded
26. unhoped
27. unidentified
28. unnoticing
29. unperceiving
30. unpractical
 31. unreceptive
32. unrecognized
33. unscripted
34. unseeing
35. unsensed
36. unstaged
37. unthought-of
38. untold
39. unvaluable

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You can look up the words in the phrase individually using these links:   not ?   supposed ?   to ?   happen ?
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