Sorry, no online dictionaries contain the exact phrase I'm not certain.
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Reverse dictionary results:
1. iffy
 2. indefinite
3. some
4. avoidable
5. hesitant
6. uncertain
7. contingent
8. sure
9. incontrovertible
10. insecure
 11. probable
12. unfailing
13. unsure
14. contingency
15. absolute
16. foreign
17. heuristic
18. indeterminate
19. likely
20. such
 21. uncut
22. undoubted
23. unwarranted
24. assured
25. doubtful
26. ignoble
27. laity
28. unadjusted
29. calculated
30. extravagant
 31. safety
32. absent
33. automatic
34. ball
35. cloudy
36. conditional
37. dead
38. definite
39. exclusive
40. hedge

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You can look up the words in the phrase individually using these links:   i'm ?   not ?   certain ?
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