Sorry, no online dictionaries contain the exact phrase opposite of valid.
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Reverse dictionary results:
1. invalid
 2. void
3. null
4. false
5. untrue
6. improper
7. inept
8. noncomprehension
9. abortive
10. anticlimactic
 11. assertion
12. disadvantageous
13. effectless
14. frustraneous
15. frustrate
16. futile
17. gainless
18. handwaving
19. ill-equipped
20. inapt
 21. incapable
22. incognizance
23. incompetent
24. inconducive
25. inconsequential
26. inconsiderable
27. inconversant
28. indifferent
29. indisposed
30. ineffective
 31. ineffectively
32. ineffectual
33. ineffectualness
34. inefficacious
35. inefficaciously
36. inefficaciousness
37. inefficient
38. inexpedient
39. inopportune

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