Sorry, no online dictionaries contain the exact phrase lack of validity.
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Reverse dictionary results:
1. invalidity
 2. unreality
3. force
4. forces
5. void
6. bad
7. intolerance
8. adequacy
9. allow
10. stamp
 11. accuracy
12. acknowledge
13. authority
14. baf
15. bsd
16. challenge
17. control
18. controlled
19. controlling
20. correctness
 21. effectiveness
22. expired
23. failed
24. fails
25. health
26. hollow
27. hollowing
28. independent
29. invalid
30. justice
 31. lapse
32. lapsed
33. logic
34. maintain
35. mythic
36. mythical
37. mythological
38. null
39. nullity
40. period

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You can look up the words in the phrase individually using these links:   lack ?   of ?   validity ?
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