Sorry, no online dictionaries contain the exact phrase impenetrable to light.
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Reverse dictionary results:
1. opaque
 2. nontransparent
3. dark
4. obscure
5. cloudy
6. hidden
7. dim
8. indistinct
9. hazy
10. impenetrable
 11. radiopacity
12. complicated
13. cryptogenic
14. dense
15. fuzzy
16. stretchiness
17. unsharpness
18. limpidness
19. occulted
20. occult
 21. arcane
22. blurredness
23. cryptic
24. deep
25. deturgescence
26. fluidity
27. fluidness
28. loom
29. lucidness
30. obscurantism
 31. sphinx
32. unsharp
33. blurry
34. complicacy
35. contractedness
36. ill-defined

You can look up the words in the phrase individually using these links:   impenetrable ?   to ?   light ?
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impe*to search for words beginning with impe, or
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