Sorry, no online dictionaries contain the exact phrase opposite of mastery.
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Reverse dictionary results:
1. expert
 2. calm
3. face
4. lord
5. own
6. apathy
7. adept
8. conquer
9. grapple
10. mastership
 11. practice
12. art
13. cinch
14. command
15. control
16. dominion
17. grip
18. learn
19. master
20. mastering
 21. rule
22. ruled
23. skill
24. advantage
25. battle
26. conflict
27. about face
28. against
29. antiparticle
30. balance
 31. balancing
32. come
33. counterpoint
34. couple
35. critical
36. crotch
37. dada
38. dall
39. difference
40. elective

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