1. Impenetrable
2. Murky
3. Obscure
4. Cloudy
5. Covered
6. Dark
7. Dense
8. Dim
9. Foggy
10. Heavy
11. Incomprehensible
12. Indistinct
13. Inscrutable
14. Latent
15. Masked
16. Misty
17. Murky
18. Nebulous
19. Non-transparent
20. Opacify
21. Opaquely
22. Obfuscated
23. Obscure
24. Obscuring
25. Shadowy
26. Solid
27. Thick
28. Unclear
29. Unintelligible
30. Vague

When searching for alternative words for “opaque”, there are many ideas to consider. Impenetrable, murky, obscure, cloudy, covered, dark, dense, dim, foggy, heavy, incomprehensible, indistinct, inscrutable, latent, masked, misty, murky, nebulous, non-transparent, opacify, opaquely, obfuscated, obscure, obscuring, shadowy, solid, thick, unclear, unintelligible, and vague are all great options. Each of these words can be used to describe something that is not transparent or easily seen through. Whether you are looking for the best word to describe something that is not transparent, or just need some great ideas for alternative words for “opaque”, these synonyms are sure to provide you with the perfect solution.