Sorry, no online dictionaries contain the exact phrase opposite of undefined.
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Reverse dictionary results:
1. else
2. alarm
3. any
4. discontinuity
5. district
6. measure
7. qualify
8. qualifying
9. shadow
10. shadowed
11. spell
12. vicinity
13. devil
14. transverse
15. adn
16. affected
17. agnostic
18. ainu
19. amd
20. amortize
21. and
22. ane
23. bogey
24. circumscribe
25. clean
26. cleaned
27. cloudy
28. dirt
29. doubleminded
30. doublespeak
31. doubt
32. equality
33. erratic
34. essential
35. everlasting
36. factorial
37. frigg
38. henceforward
39. incorrect
40. insurance

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