| No. | Item | Definition |
|---|---|---|
| 1. | abstruse | hard to comprehend |
| 2. | allusive | referring indirectly |
| 3. | ambiguous | open to more than one meaning |
| 4. | amorphous | without clear shape or form |
| 5. | arcane | understood by very few people |
| 6. | baffling | extremely confusing or puzzling |
| 7. | bewildering | causing great confusion |
| 8. | bizarre | very strange and puzzling |
| 9. | bottomless | seemingly impossible to fathom |
| 10. | byzantine | highly complex and puzzling |
| 11. | cloaked | covered or hidden |
| 12. | coded | expressed in hidden terms |
| 13. | concealed | kept from being known |
| 14. | confounding | defying understanding or expectation |
| 15. | covert | not openly shown or known |
| 16. | cryptic | having a hidden meaning |
| 17. | curious | strange and interestingly unclear |
| 18. | curiously vague | oddly lacking clarity |
| 19. | dark | mysterious or threateningly unclear |
| 20. | deep | difficult to fully understand |
| 21. | Delphic | obscurely ambiguous or puzzling |
| 22. | disguised | hidden under another form |
| 23. | dreamlike | vaguely unreal and mysterious |
| 24. | eerie | strange and mysteriously unsettling |
| 25. | elliptical | using indirect or incomplete wording |
| 26. | elusive | difficult to grasp or define |
| 27. | enigmatical | mysterious and hard to explain |
| 28. | equivocal | open to different interpretations |
| 29. | esoteric | intended for a select few |
| 30. | evasive | avoiding clear answers |
| 31. | fantastical | strangely imaginative or unreal |
| 32. | foggy | unclear or indistinct |
| 33. | hard to decipher | difficult to interpret |
| 34. | hard to explain | not easily accounted for |
| 35. | hard to fathom | difficult to comprehend |
| 36. | hard to figure out | difficult to understand |
| 37. | hard to grasp | difficult to understand clearly |
| 38. | hard to know | not easy to understand |
| 39. | hard to pin down | difficult to define exactly |
| 40. | hard to read | difficult to interpret |
| 41. | impenetrable | impossible to understand fully |
| 42. | incomprehensible | impossible to understand |
| 43. | indecipherable | impossible to interpret or read |
| 44. | indefinable | hard to describe clearly |
| 45. | indeterminate | not exactly known or fixed |
| 46. | inexplicable | unable to be explained |
| 47. | inscrutable | impossible to read or understand |
| 48. | insubstantial | vague and hard to define |
| 49. | knotty | difficult to unravel or solve |
| 50. | labyrinthine | confusingly complex |
| 51. | layered | having several hidden meanings |
| 52. | masked | concealed behind an appearance |
| 53. | misty | dim, vague, or unclear |
| 54. | moot | open to debate or uncertainty |
| 55. | murky | unclear or hard to interpret |
| 56. | mysterious | hard to understand or explain |
| 57. | mystifying | making something hard to grasp |
| 58. | nebulous | vague and ill-defined |
| 59. | noncommittal | not revealing a clear position |
| 60. | not obvious | not easy to see |
| 61. | not self-explanatory | needing explanation to understand |
| 62. | not straightforward | not simple or obvious |
| 63. | not transparent | not open or clear |
| 64. | obscure | not clear or easily understood |
| 65. | odd | unusual in a puzzling way |
| 66. | offbeat | unusual in a puzzling way |
| 67. | opaque | not easy to understand |
| 68. | open-ended | without a clear conclusion |
| 69. | oracular | mysteriously wise or obscure |
| 70. | otherworldly | strangely unlike ordinary life |
| 71. | outlandish | strangely unusual or bizarre |
| 72. | peculiar | strange or difficult to explain |
| 73. | perplexing | very confusing or baffling |
| 74. | profound | very deep or hard to grasp |
| 75. | puzzling | causing confusion or uncertainty |
| 76. | queer | strange or hard to account for |
| 77. | quietly strange | subtly odd or mysterious |
| 78. | recondite | difficult to understand |
| 79. | riddle-like | resembling a riddle |
| 80. | shadowy | vague and hard to know |
| 81. | shrouded | covered or hidden from view |
| 82. | sibylline | darkly prophetic and obscure |
| 83. | sphinxlike | mysteriously silent and unreadable |
| 84. | strange | unusual and hard to explain |
| 85. | strangely opaque | oddly hard to understand |
| 86. | strangely unreadable | oddly difficult to interpret |
| 87. | surreal | strangely unreal or puzzling |
| 88. | thorny | difficult and complicated |
| 89. | unaccountable | not easily explained |
| 90. | uncanny | strange in an unsettling way |
| 91. | uncategorizable | not easily classified |
| 92. | undefinable | impossible to describe exactly |
| 93. | undefined | not clearly described |
| 94. | unfathomable | too deep to understand |
| 95. | unknowable | impossible to know fully |
| 96. | unreadable | hard to interpret or understand |
| 97. | vague | not clearly expressed or defined |
| 98. | veiled | partly hidden or concealed |
| 99. | weird | strangely difficult to explain |
| 100. | wily | clever in a secretive way |