| No. | Item | Definition |
|---|---|---|
| 1. | abstruse | difficult to understand |
| 2. | allusive | indirectly suggestive or referential |
| 3. | ambiguous | open to more than one meaning |
| 4. | anomalous | deviating from what is normal |
| 5. | anonymous | of unknown identity |
| 6. | arcane | understood by very few people |
| 7. | baffling | very difficult to understand |
| 8. | bewildering | extremely confusing |
| 9. | beyond explanation | impossible to explain |
| 10. | beyond understanding | too difficult to understand |
| 11. | blank | showing no readable expression |
| 12. | clandestine | kept secret or done secretly |
| 13. | closemouthed | not likely to talk freely |
| 14. | clouded | made unclear or uncertain |
| 15. | coded | expressed in hidden form |
| 16. | confounding | causing surprise and confusion |
| 17. | covert | hidden and secret |
| 18. | cryptic | having a hidden meaning |
| 19. | curious | strange or unusual |
| 20. | dark | unclear or secretive |
| 21. | deep | profound and hard to grasp |
| 22. | detached | emotionally removed and unreadable |
| 23. | dim | faint, unclear, or vague |
| 24. | dreamlike | having an unreal quality |
| 25. | eerie | strange and frightening |
| 26. | eerily unclear | strangely and unsettlingly vague |
| 27. | elliptical | using puzzlingly incomplete language |
| 28. | elusive | hard to grasp or define |
| 29. | enigmatic | hard to understand or explain |
| 30. | enigmatical | mysterious and hard to explain |
| 31. | esoteric | understood by a select few |
| 32. | expressionless | showing no clear emotion |
| 33. | faceless | without clear identity |
| 34. | fantastic | strange or hard to believe |
| 35. | fantastical | oddly imaginative or unreal |
| 36. | fascinatingly obscure | interestingly difficult to understand |
| 37. | foggy | confused or unclear |
| 38. | full of secrets | containing many hidden things |
| 39. | ghostly | strangely pale or eerie |
| 40. | guarded | careful not to reveal much |
| 41. | hard to pin down | difficult to define clearly |
| 42. | hard to place | difficult to identify exactly |
| 43. | hard to read | difficult to interpret |
| 44. | haunting | strangely memorable and eerie |
| 45. | hazy | unclear or indistinct |
| 46. | hermetic | tightly closed off or obscure |
| 47. | impenetrable | impossible to understand fully |
| 48. | imponderable | hard to assess or understand |
| 49. | incomprehensible | impossible to understand |
| 50. | indecipherable | impossible to read or understand |
| 51. | indeterminate | not exactly known or fixed |
| 52. | indistinct | not clear or sharply defined |
| 53. | inexplicable | unable to be explained |
| 54. | inscrutable | impossible to interpret or understand |
| 55. | murky | dark, unclear, or confusing |
| 56. | mystifying | making something hard to understand |
| 57. | nameless | without a known name |
| 58. | not what it seems | deceptively different from appearance |
| 59. | obfuscated | made deliberately unclear |
| 60. | obscure | not clear or easily understood |
| 61. | occult | hidden, secret, or supernatural |
| 62. | odd | different in a puzzling way |
| 63. | opaque | not transparent in meaning |
| 64. | oracular | cryptic and authoritative sounding |
| 65. | otherworldly | strangely unlike ordinary life |
| 66. | out of the ordinary | unusual in a notable way |
| 67. | outlandish | strange and unusual |
| 68. | peculiar | strange or odd |
| 69. | perplexing | confusing and hard to understand |
| 70. | poker-faced | showing no readable emotion |
| 71. | puzzling | causing confusion or curiosity |
| 72. | recondite | little known and difficult |
| 73. | remote | distant and hard to know |
| 74. | reserved | quiet and not revealing much |
| 75. | reticent | not revealing one’s thoughts readily |
| 76. | shadowy | vague, secretive, or unclear |
| 77. | shrouded | covered or hidden from view |
| 78. | sibylline | darkly prophetic and obscure |
| 79. | singular | strikingly unusual or unique |
| 80. | sphinxlike | silent and hard to read |
| 81. | spooky | frightening in a strange way |
| 82. | strange | unusual and hard to explain |
| 83. | supernatural | beyond normal natural explanation |
| 84. | surreal | strangely dreamlike or unreal |
| 85. | symbolic | expressed through symbols |
| 86. | tenebrous | dark, obscure, or shadowy |
| 87. | tight-lipped | unwilling to reveal information |
| 88. | unaccountable | unable to be explained logically |
| 89. | uncanny | strangely unsettling or hard to explain |
| 90. | unclear | not easy to understand |
| 91. | unexplained | not yet accounted for |
| 92. | unfathomable | too deep to understand |
| 93. | unknowable | impossible to know fully |
| 94. | unknown | not known or identified |
| 95. | unsolved | not yet explained or resolved |
| 96. | vague | not clearly expressed or understood |
| 97. | veiled | partly hidden or concealed |
| 98. | weird | strangely unusual or unsettling |
| 99. | withdrawn | emotionally distant and hard to know |
| 100. | wrapped in secrecy | surrounded by secrecy |
