Sorry, no online dictionaries contain the exact phrase not possible to know beforehand.

Reverse dictionary results:
1. unknown
2. ready-made
3. unpredictable
4. unprepared
5. failing
6. incalculable
7. unforeseen
8. unknowable
9. unpremeditated
10. canned
11. impossible
12. unscripted
13. improviso
14. contingency
15. contingent
16. actual
17. optional
18. existent
19. feasible
20. maybe
21. possibility
22. soap
23. undeniable
24. unclassifiable
25. can
26. flat
27. hopeless
28. impossibility
29. impossibly
30. impracticable
31. impractical
32. impulsive
33. in posse
34. incommunicado
35. inconceivable
36. infeasible
37. insufferable
38. lacking
39. least
40. mean

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You can look up the words in the phrase individually using these links:   not ?   possible ?   to ?   know ?   beforehand ?
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