| No. | Item | Definition |
|---|---|---|
| 1. | abstruse | hard to understand |
| 2. | ambiguous | having more than one unclear meaning |
| 3. | amorphous | without clear shape or definition |
| 4. | arcane | understood by only a few |
| 5. | baffling | impossible to understand easily |
| 6. | bewildering | extremely confusing |
| 7. | blackout | designed to block all light |
| 8. | bleary | blurred and unclear to see |
| 9. | blurred | made unclear or less distinct |
| 10. | byzantine | highly complex and confusing |
| 11. | cloaked | hidden or disguised |
| 12. | cloudy | not transparent or mentally clear |
| 13. | complex | not simple or easy to grasp |
| 14. | complicated | hard to understand or explain |
| 15. | concealed | kept from being seen |
| 16. | confusing | difficult to understand clearly |
| 17. | convoluted | complex and hard to follow |
| 18. | cryptic | mysterious and hard to understand |
| 19. | dark | not light; unclear in meaning |
| 20. | dense | thick and hard to see through |
| 21. | dim | not bright or clearly seen |
| 22. | disguised | made to seem different or hidden |
| 23. | disordered | lacking clear arrangement or sense |
| 24. | dull | not bright, clear, or vivid |
| 25. | elliptical | using words that leave meaning unclear |
| 26. | enameled | coated with opaque glossy finish |
| 27. | enigmatic | mysterious and difficult to interpret |
| 28. | equivocal | open to more than one meaning |
| 29. | evasive | avoiding clear answers |
| 30. | filmy | covered with a thin cloudy layer |
| 31. | flat | lacking clarity or vividness |
| 32. | foggy | lacking clarity or transparency |
| 33. | formless | lacking clear shape or structure |
| 34. | frosted | made cloudy and not transparent |
| 35. | fuzzy | not clear or precise |
| 36. | garbled | distorted and hard to understand |
| 37. | hazy | unclear or blurred |
| 38. | hidden | kept from view or knowledge |
| 39. | ill-defined | not clearly described or bounded |
| 40. | impenetrable | impossible to see through or grasp |
| 41. | impervious | not allowing passage through |
| 42. | incoherent | not logically connected or clear |
| 43. | incomprehensible | too difficult to understand |
| 44. | indefinite | not exact, clear, or settled |
| 45. | indirect | not expressed plainly or directly |
| 46. | indistinct | not clear or sharply defined |
| 47. | inscrutable | impossible to understand or read |
| 48. | involved | complicated and not clear |
| 49. | jumbled | mixed up and unclear |
| 50. | knotty | difficult and confusing |
| 51. | labyrinthine | extremely complicated and confusing |
| 52. | lacquered | coated, reducing transparency |
| 53. | light-blocking | preventing light from passing |
| 54. | lightproof | not letting light pass through |
| 55. | masked | concealed from view or meaning |
| 56. | milky | whitish and not transparent |
| 57. | misty | clouded or not clearly seen |
| 58. | muddled | confused and unclear |
| 59. | muddy | not clear in color or meaning |
| 60. | murky | dark, unclear, or hard to understand |
| 61. | mysterious | difficult to explain or understand |
| 62. | nebulous | vague and ill-defined |
| 63. | nonlucent | not transmitting light clearly |
| 64. | nonsee-through | not transparent |
| 65. | nonspecific | not detailed or clear |
| 66. | nontransparent | not allowing light or openness |
| 67. | obfuscated | made confusing or unclear |
| 68. | oblique | indirect or not explicit |
| 69. | obscure | hard to understand; not clear |
| 70. | occluding | blocking from view |
| 71. | opacified | made opaque or less clear |
| 72. | painted | covered with nontransparent color |
| 73. | perplexing | causing confusion or uncertainty |
| 74. | pigmented | colored enough to reduce transparency |
| 75. | puzzling | hard to understand or explain |
| 76. | recondite | difficult for ordinary people to understand |
| 77. | roundabout | not direct or straightforward |
| 78. | shadowy | dim, vague, or mysterious |
| 79. | shrouded | covered or hidden from understanding |
| 80. | smeared | blurred and unclear |
| 81. | smoky | clouded like smoke |
| 82. | smudged | marked so details are unclear |
| 83. | solid | not transparent; dense |
| 84. | stained | colored so light passes poorly |
| 85. | tenebrous | dark, obscure, or hard to understand |
| 86. | thick | not clear or easy to penetrate |
| 87. | thorny | difficult and complicated |
| 88. | tinted | colored and less transparent |
| 89. | tortuous | full of twists; hard to follow |
| 90. | uncertain | not definitely known or clear |
| 91. | unclear | not easy to understand or see through |
| 92. | undecipherable | not able to be deciphered |
| 93. | undefined | not clearly stated or fixed |
| 94. | unfathomable | too deep or strange to understand |
| 95. | unintelligible | impossible to understand |
| 96. | unknowable | impossible to know clearly |
| 97. | unreadable | hard to interpret or understand |
| 98. | vague | not clearly expressed or understood |
| 99. | veiled | partly hidden or obscured |
| 100. | whitewashed | covered so details are hidden |
