| No. | Item | Definition |
|---|---|---|
| 1. | ambiguous | having more than one meaning |
| 2. | backlit | lit from behind, appearing dark |
| 3. | backroom | secret and unofficial |
| 4. | baleful | threatening harm or evil |
| 5. | behind-the-scenes | hidden from public view |
| 6. | black | very dark in color |
| 7. | bleak | dark, cold, and empty |
| 8. | blurred | not sharp or distinct |
| 9. | brooding | darkly thoughtful or threatening |
| 10. | camouflaged | disguised to avoid notice |
| 11. | clandestine | kept secret, often illegally |
| 12. | clouded | made unclear or dim |
| 13. | concealed | kept from view |
| 14. | covered | hidden by something over it |
| 15. | covert | hidden and secret |
| 16. | crepuscular | dim like twilight |
| 17. | cryptic | having a hidden meaning |
| 18. | dark | having little or no light |
| 19. | darkened | made darker or dimmer |
| 20. | devious | not straightforward; sneaky |
| 21. | dim | poorly lit; not bright |
| 22. | disreputable | not respectable; suspect |
| 23. | dodgy | dishonest or suspicious |
| 24. | dull | not bright or vivid |
| 25. | dusky | somewhat dark or dim |
| 26. | eerie | strange and frightening |
| 27. | enigmatic | mysterious and hard to understand |
| 28. | equivocal | open to more than one meaning |
| 29. | faint | barely visible or noticeable |
| 30. | fishy | seeming dishonest or suspicious |
| 31. | foggy | filled with fog; unclear |
| 32. | forbidding | unfriendly and threatening |
| 33. | furtive | secretive and avoiding notice |
| 34. | ghostly | pale, eerie, or spectral |
| 35. | gloomy | dark, dim, or depressing |
| 36. | gray | dull and lacking brightness |
| 37. | grim | stern, dark, or forbidding |
| 38. | half-lit | partly lit and dim |
| 39. | haunting | evocative and disturbingly persistent |
| 40. | hazy | slightly obscured or unclear |
| 41. | hidden | kept out of sight |
| 42. | impenetrable | impossible to understand fully |
| 43. | in the dark | hidden from knowledge or view |
| 44. | indefinite | not clearly fixed or defined |
| 45. | indistinct | not sharply clear |
| 46. | inscrutable | impossible to interpret or understand |
| 47. | invisible | unable to be seen |
| 48. | lightless | without light |
| 49. | low-contrast | not sharply differentiated |
| 50. | low-lit | having little lighting |
| 51. | masked | hidden behind a cover |
| 52. | menacing | suggesting danger or threat |
| 53. | misty | obscured by fine moisture |
| 54. | murky | dark and hard to see through |
| 55. | muted | softened or toned down |
| 56. | mysterious | difficult to explain or understand |
| 57. | nebulous | vague and ill-defined |
| 58. | nefarious | wickedly criminal or evil |
| 59. | nighttime | relating to the night |
| 60. | nocturnal | active or occurring at night |
| 61. | obfuscated | made deliberately unclear |
| 62. | obscure | not clear or easily seen |
| 63. | offstage | kept out of public view |
| 64. | ominous | suggesting something bad ahead |
| 65. | on the sly | secretly and quietly |
| 66. | opaque | hard to understand or see through |
| 67. | oracular | mysteriously hard to understand |
| 68. | out of sight | not visible or noticeable |
| 69. | phantom | ghostly or unreal |
| 70. | questionable | open to doubt or suspicion |
| 71. | rackety | dishonest or disreputable |
| 72. | screened | hidden from view or notice |
| 73. | secret | kept hidden from others |
| 74. | semi-dark | partly dark |
| 75. | shaded | protected from direct light |
| 76. | shadowed | covered in shade or gloom |
| 77. | shady | suspicious or partly shaded |
| 78. | shrouded | covered or hidden from view |
| 79. | sly | secretively clever or deceitful |
| 80. | smoky | filled with smoke or haze |
| 81. | sneaky | secretive and dishonest |
| 82. | sunless | lacking sunlight |
| 83. | suspicious | causing doubt or mistrust |
| 84. | tainted | spoiled by wrongdoing or suspicion |
| 85. | tenebrous | dark, obscure, or sinister |
| 86. | twilit | lit like twilight |
| 87. | uncanny | strange in an unsettling way |
| 88. | unclear | not easy to understand or see |
| 89. | undercover | working secretly under disguise |
| 90. | unlit | not illuminated |
| 91. | unnoticed | not observed or detected |
| 92. | unobserved | not watched or seen |
| 93. | unsavory | morally unpleasant or suspect |
| 94. | unseen | not seen or noticed |
| 95. | vague | not clearly expressed or defined |
| 96. | veiled | partly hidden or disguised |
| 97. | villainous | wickedly criminal or immoral |
| 98. | washed-out | faded and lacking clarity |
| 99. | weird | strange and unsettling |
| 100. | wraithlike | thin, ghostly, and shadowy |