Sorry, no online dictionaries contain the exact phrase ill defined boundary.
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Reverse dictionary results:
1. gray
 2. phase
3. crud
4. dim
5. vague
6. blob
7. dimmed
8. dimming
9. nervous breakdown
10. neurasthenia
 11. unclear
12. diffused
13. fantods
14. misty
15. smeared
16. hinterland
17. silicic acid
18. amorphous shape
19. nebulation
20. nebulous
 21. scythian
22. splotched
23. twilight zone
24. edgy
25. limit
26. limiting
27. determinate
28. discontinuity
29. narrow
30. inland
 31. diffuse
32. indecisive
33. outback
34. unfenced
35. rough
36. borderline
37. form
38. absolute
39. adventive
40. aside

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You can look up the words in the phrase individually using these links:   ill ?   defined ?   boundary ?
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