Sorry, no online dictionaries contain the exact phrase not impermeable.
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Reverse dictionary results:
1. impervious
2. caoutchouc
3. tight
4. airtight
5. watertight
6. costive
7. balloon
8. air-tight
9. rainproof
10. artesian well
11. cork
12. any
13. aware
14. bad
15. baf
16. blinds
17. bsd
18. drafty
19. fast
20. gravel-blind
21. gutter
22. hard
23. hutter
24. impregnable
25. infirm
26. insecure
27. inviolate
28. light
29. lock
30. locking
31. locks
32. loose
33. nonimmune
34. nonresistant
35. nonviolent
36. odds
37. opaque
38. open
39. risky
40. safe

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You can look up the words in the phrase individually using these links:   not ?   impermeable ?
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