Sorry, no online dictionaries contain the exact phrase undefined boundary.
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Reverse dictionary results:
1. frontier
2. border
3. edge
4. margin
5. perimeter
6. ambitus
7. barrier
8. border control
9. border on
10. bordering
11. borderland
12. brink
13. demarcation line
14. dole
15. fringing
16. platband
17. skirt
18. state line
19. abuttals
20. ambit
21. bootheel
22. border reiver
23. borderer
24. borderline
25. boundary
26. cordon
27. county line
28. march
29. marge
30. marged
31. marginal
32. meer
33. meta
34. mete
35. rand
36. row

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