Sorry, no online dictionaries contain the exact phrase unable to be defeated.
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Reverse dictionary results:
1. invincible
 2. unbeatable
3. indestructible
4. unconquerable
5. impregnable
6. escapeless
7. eternal sin
8. formidable
9. immarcescible
10. immitigable
 11. impacable
12. inaccessible
13. inappellable
14. incorrigible
15. indefensible
16. indissoluble
17. indomable
18. ineffaceable
19. inescapable
20. inexpugnable
 21. informidable
22. insanable
23. insecable
24. insoluble
25. insolvable
26. insuperable
27. insupportable
28. irradicable
29. irremeable
30. irrepressible
 31. irresoluble
32. irrestrainable
33. remediless
34. skippable
35. spilt milk
36. unalterable
37. unapproachable
38. unassuageable
39. unatonable

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