Sorry, no online dictionaries contain the exact phrase opposite of porous.
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Reverse dictionary results:
1. nonporous
 2. impermeable
3. dense
4. solid
5. compact
6. impassive
7. inert
8. purely
9. stirless
10. motionlessly
 11. moveless
12. torpid
13. imperturbable
14. infecund
15. insubstantial
16. intuition
17. memorylessness
18. obscure
19. off
20. rootlessness
 21. silently
22. wordlessness
23. absolute
24. absurd
25. automagically
26. clear
27. handwaving
28. inanimate
29. indetermination
30. infecundity
 31. spontaneous
32. sporadic
33. vague
34. vegetative
35. voicelessness
36. all the same
37. amorphous
38. artless
39. au naturel

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