Sorry, no online dictionaries contain the exact phrase opposite of mastered.
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Reverse dictionary results:
1. tyro
2. law
3. master
4. mastering
5. medicine
6. pat
7. easy
8. facile
9. know
10. ace
11. across
12. ball
13. bang
14. bear
15. bow
16. counteract
17. dash
18. deep
19. elective
20. gain
21. lay
22. lit
23. negation
24. nemesis
25. nod
26. old
27. oppose
28. over
29. plan
30. prone
31. pull
32. put
33. reversal
34. slam
35. subside
36. traverse
37. trot
38. turn
39. backtrack
40. backtracking

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You can look up the words in the phrase individually using these links:   opposite ?   of ?   mastered ?
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