Sorry, no online dictionaries contain the exact phrase difficult to define.
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Reverse dictionary results:
1. ambiguous
2. elusive
3. indefinable
4. vague
5. obscure
6. blind
7. evanescent
8. hidden
9. impercipient
10. incoherent
11. incommensurately
12. indeterminant
13. indeterminate
14. indistinguished
15. intangibly
16. subtle
17. transparent
18. undecisive
19. underdetermined
20. unstable
21. arbitrarily
22. desultory
23. fathomlessly
24. imperceptibly
25. imperceptive
26. inaccessibly
27. incognita
28. incommunicado
29. incomunicado
30. indefinably
31. indeterminately
32. indirect
33. indistinguishably
34. inexact
35. insensible
36. invisible
37. invisibly

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