Sorry, no online dictionaries contain the exact phrase not sure what to say.
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Reverse dictionary results:
1. unsure
 2. hesitant
3. uncertain
4. tongue-tied
5. at loss for words
6. inadvisably
7. indigently
8. insecurely
9. intemperately
10. irresolutely
 11. dither
12. doubtful
13. dysfunctionally
14. equivocal
15. equivocally
16. ill
17. immoderately
18. implausibly
19. impotently
20. impractically
 21. imprecisely
22. in doubt
23. inappropriately
24. inaptly
25. incautiously
26. incertainty
27. incompetently
28. inconveniently
29. incredulously
30. incuriously
 31. indecisively
32. ineptly
33. inopportunely
34. inordinately
35. intendedly
36. irresolute
37. irresolution
38. maladaptively
39. negligently

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You can look up the words in the phrase individually using these links:   not ?   sure ?   what ?   to ?   say ?
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