Sorry, no online dictionaries contain the exact phrase unbeknownst to someone.
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Reverse dictionary results:
1. unaware
 2. oblivious
3. ignorant
4. uninformed
5. unsuspecting
6. deaf
7. ill-conceived
8. simple
9. unadvised
10. unconvinced
 11. unfashionable
12. unheedful
13. uninforming
14. unreflecting
15. unskillful
16. unware
17. unwitting
18. blindly
19. causelessly
20. connivent
 21. discreet
22. feckless
23. guiltless
24. impenitently
25. inadept
26. inconversant
27. indifferent
28. indiscriminate
29. inept
30. informed
 31. innocent
32. inscient
33. insignificative
34. irrespective of
35. irresponsible
36. mistrustless
37. none the wiser
38. nonprincipled

You can look up the words in the phrase individually using these links:   unbeknownst ?   to ?   someone ?
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unbe*to search for words beginning with unbe, or
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