| No. | Item | Definition |
|---|---|---|
| 1. | abstruse | difficult to understand |
| 2. | arcane | understood by very few people |
| 3. | arduous | requiring much effort |
| 4. | baffling | very hard to understand |
| 5. | baroque | overly elaborate or complex |
| 6. | bewildering | confusing and hard to follow |
| 7. | branching | dividing into many parts |
| 8. | byzantine | extremely complex and confusing |
| 9. | challenging | difficult in a stimulating way |
| 10. | complex | having many connected parts |
| 11. | compound | made of multiple parts |
| 12. | confused | lacking clear order |
| 13. | confusing | hard to understand clearly |
| 14. | convoluted | overly complex or twisted |
| 15. | cryptic | having hidden or unclear meaning |
| 16. | daunting | seeming difficult to manage |
| 17. | deep | complex and thoughtful |
| 18. | demanding | requiring much effort or skill |
| 19. | devious | not straightforward or direct |
| 20. | difficult | not easy to understand or handle |
| 21. | diverse | made up of different parts |
| 22. | elaborate | carefully detailed and complex |
| 23. | enigmatic | mysterious and hard to understand |
| 24. | entangled | caught in a complex situation |
| 25. | equivocal | unclear or open to interpretation |
| 26. | esoteric | understood by specialists only |
| 27. | exacting | requiring great precision |
| 28. | fiddly | awkward with small details |
| 29. | fine-grained | having many small distinctions |
| 30. | finicky | requiring exacting attention |
| 31. | foggy | unclear or confused |
| 32. | formidable | difficult to deal with |
| 33. | fussy | too detailed or particular |
| 34. | gnarly | difficult or complex |
| 35. | hairy | difficult and risky |
| 36. | hard | difficult to do or understand |
| 37. | hazy | not clear or definite |
| 38. | heterogeneous | made of varied elements |
| 39. | high-level | advanced or complex |
| 40. | hybrid | made from different kinds |
| 41. | interconnected | linked in many ways |
| 42. | interdependent | relying on each other |
| 43. | interlaced | woven or connected together |
| 44. | intertwined | closely connected and hard to separate |
| 45. | interwoven | closely mixed together |
| 46. | intricate | having many detailed parts |
| 47. | involved | difficult because of many parts |
| 48. | jumbled | mixed up and disorderly |
| 49. | knotty | difficult to solve |
| 50. | laborious | requiring long, hard work |
| 51. | labyrinthine | like a maze; very complex |
| 52. | layered | having multiple levels or meanings |
| 53. | many-sided | having several aspects |
| 54. | messy | disordered and difficult to handle |
| 55. | muddled | confused or disorganized |
| 56. | multi-step | involving several stages |
| 57. | multifaceted | having many different aspects |
| 58. | multilayered | having several connected layers |
| 59. | multiphase | involving several phases |
| 60. | multistage | involving several stages |
| 61. | mysterious | hard to explain or understand |
| 62. | nebulous | vague and unclear |
| 63. | not simple | more complex than basic |
| 64. | not straightforward | not direct or simple |
| 65. | nuanced | having fine distinctions |
| 66. | obscure | not clear or easily understood |
| 67. | onerous | burdensome and difficult |
| 68. | opaque | hard to understand |
| 69. | ornate | elaborately detailed |
| 70. | overcomplex | excessively complex |
| 71. | overcomplicated | more complex than necessary |
| 72. | particular | requiring careful attention to details |
| 73. | perplexing | causing uncertainty or confusion |
| 74. | problematic | presenting difficulties or problems |
| 75. | puzzling | difficult to explain or understand |
| 76. | ramified | having many branches |
| 77. | recondite | little known and hard to understand |
| 78. | riddling | puzzling or mysterious |
| 79. | rigorous | requiring careful precision |
| 80. | rough | difficult or unpleasant |
| 81. | roundabout | not direct or simple |
| 82. | slippery | hard to define or handle |
| 83. | sophisticated | advanced and not simple |
| 84. | sticky | awkward or difficult to handle |
| 85. | subtle | not obvious or simple |
| 86. | tangled | twisted together and confusing |
| 87. | taxing | requiring great effort |
| 88. | technical | requiring specialized knowledge |
| 89. | thorny | full of difficulties |
| 90. | tough | difficult to deal with |
| 91. | tricky | requiring care or skill |
| 92. | twisted | not straightforward or clear |
| 93. | twisty | full of turns or complications |
| 94. | unclear | not easy to understand |
| 95. | unfathomable | impossible to fully understand |
| 96. | unwieldy | hard to manage because complex |
| 97. | vague | not clearly expressed or defined |
| 98. | varied | having different forms or elements |
| 99. | vexed | difficult and much debated |
| 100. | vexing | annoyingly difficult |
