Sorry, no online dictionaries contain the exact phrase fear of unknown.
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Reverse dictionary results:
1. xenophobia
2. agoraphobia
3. uncertainty anxiety
4. fear of unfamiliar
5. superstition
6. timidity
7. timidness
8. timorousness
9. anxious
10. people
11. alarm
12. alarmingly
13. angst
14. anxiety
15. bugaboo
16. bugbear
17. care
18. check
19. concern
20. doubt
21. dream
22. eerie
23. eeriness
24. eery
25. feared
26. fearing
27. frantic
28. frenzied
29. fright
30. frightful
31. horrible
32. horror
33. hysteric
34. insecure
35. mortal
36. nyctophobia
37. panic
38. paranoia
39. secure

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You can look up the words in the phrase individually using these links:   fear ?   of ?   unknown ?
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