Sorry, no online dictionaries contain the exact phrase opposite of proficient.
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Reverse dictionary results:
1. expert
2. adept
3. capable
4. conversant
5. accomplished
6. excel
7. lose
8. loses
9. master
10. mastering
11. perfect
12. perfected
13. perfecting
14. train
15. trained
16. adverse
17. away
18. booing
19. brave
20. cantle
21. cut
22. disrupted
23. double-edged
24. evil
25. exhaustible
26. free
27. guilty
28. ill
29. impertinent
30. opposable
31. oppositive
32. out
33. over
34. pan
35. real
36. sin
37. sinning
38. slip
39. slipped
40. slipping

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