Sorry, no online dictionaries contain the exact phrase informal invalidity.
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Reverse dictionary results:
1. annulment
2. disability
3. invalidation
4. invalidness
5. revocation
6. bad
7. blank
8. clinker
9. dud
10. flat
11. flip
12. flipping
13. flop
14. flops
15. scrub
16. bloodbath
17. bomb
18. close call
19. disaster
20. fizzle
21. sneeze
22. tin ear
23. washout
24. abolish
25. acoustic aphasia
26. apathetic
27. apathetical
28. artless
29. auditory aphasia
30. blackhole
31. breach
32. challenge
33. continual
34. corrupt
35. corrupted
36. depreciation
37. dissolution
38. dropout
39. dyslexia
40. empty

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You can look up the words in the phrase individually using these links:   informal ?   invalidity ?
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info*to search for words beginning with info, or
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