Sorry, no online dictionaries contain the exact phrase lack of mastery.
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Reverse dictionary results:
1. incompetence
 2. ineptitude
3. deficiency
4. inadequacy
5. unskillfulness
6. neglectable
7. now
8. compulsive behaviour
9. concernancy
10. dismissiveness
 11. disregard
12. futility
13. ill-judged
14. importunity
15. imprecision
16. improvident
17. inability
18. inappreciation
19. inattentiveness
20. incircumspection
 21. incommodious
22. inconsequence
23. inconsiderateness
24. incorrection
25. ineptness
26. ingratitude
27. inordination
28. insignificancy
29. irrelevancy
30. malapropos
 31. misguided
32. neglect
33. neglectful
34. neglectfulness
35. neglection
36. negligency
37. negligent
38. unadvised

You can look up the words in the phrase individually using these links:   lack ?   of ?   mastery ?
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