| No. | Item | Definition |
|---|---|---|
| 1. | a burden | a heavy demand |
| 2. | a grind | dull, hard effort |
| 3. | a headache | a troublesome difficulty |
| 4. | a slog | hard, tiring work |
| 5. | a strain | a taxing demand |
| 6. | a trial | a difficult experience |
| 7. | an ordeal | a painful difficult experience |
| 8. | an uphill battle | a very difficult struggle |
| 9. | backbreaking | extremely physically demanding |
| 10. | big ask | a demanding request or task |
| 11. | bothersome | causing trouble or effort |
| 12. | brain-taxing | mentally demanding |
| 13. | brain-wearying | mentally exhausting |
| 14. | brutal | extremely harsh or demanding |
| 15. | bumpy | uneven and troublesome |
| 16. | burdensome | hard to carry or manage |
| 17. | challenging | requiring skill or effort |
| 18. | character-building | difficult but strengthening |
| 19. | complex | made of difficult parts |
| 20. | complicated | not simple; hard to handle |
| 21. | crushing | overwhelmingly difficult or heavy |
| 22. | cumbersome | awkward and hard to handle |
| 23. | daunting | intimidatingly difficult |
| 24. | demanding | requiring much effort or skill |
| 25. | demandingness | quality of requiring much effort |
| 26. | depleting | using up energy or resources |
| 27. | difficult | hard to do or endure |
| 28. | draining | using up energy |
| 29. | effortful | requiring noticeable effort |
| 30. | encumbering | making action more difficult |
| 31. | endurance-testing | challenging lasting strength |
| 32. | energy-sapping | draining strength or energy |
| 33. | epic | very large and demanding |
| 34. | exacting | making heavy demands |
| 35. | exhausting | making you very tired |
| 36. | fatiguing | causing tiredness |
| 37. | formidable | very difficult to overcome |
| 38. | fraught | filled with difficulty or stress |
| 39. | grind-like | resembling hard repetitive work |
| 40. | grindy | like a tiring grind |
| 41. | grueling | extremely tiring and difficult |
| 42. | gruelling | extremely tiring and difficult |
| 43. | hard | not easy; demanding effort |
| 44. | hardgoing | difficult to continue |
| 45. | harsh | rough and hard to endure |
| 46. | head-splitting | extremely mentally painful |
| 47. | heavy | serious and demanding |
| 48. | herculean | requiring great strength or effort |
| 49. | impossible | not able to be done |
| 50. | insurmountable | too difficult to overcome |
| 51. | intense | extremely demanding or severe |
| 52. | involved | complicated and demanding |
| 53. | knotty | hard to solve |
| 54. | labor-intensive | needing much human effort |
| 55. | laborious | needing much hard work |
| 56. | long haul | a lengthy demanding effort |
| 57. | major undertaking | a large demanding project |
| 58. | merciless | showing no relief or ease |
| 59. | mind-bending | extremely mentally demanding |
| 60. | monumental | extremely large and difficult |
| 61. | muscular | requiring physical strength |
| 62. | near-impossible | almost impossible |
| 63. | nerve-testing | trying patience or courage |
| 64. | no picnic | not easy or pleasant |
| 65. | onerous | burdensome and difficult |
| 66. | oppressive | heavily burdensome |
| 67. | ordeal-like | like a severe trial |
| 68. | overwhelming | too demanding to handle easily |
| 69. | painful | hard to endure |
| 70. | patience-testing | trying patience greatly |
| 71. | problematic | causing difficulty or trouble |
| 72. | punishing | severely demanding or exhausting |
| 73. | relentless | unceasing and hard to bear |
| 74. | rigorous | very thorough and demanding |
| 75. | rocky | full of difficulties |
| 76. | rough | hard and unpleasant |
| 77. | severe | harsh and difficult |
| 78. | slow-going | progressing with difficulty |
| 79. | soul-destroying | deeply draining and demoralizing |
| 80. | spirit-crushing | emotionally exhausting and harsh |
| 81. | stiff | difficult or demanding |
| 82. | straining | causing effort or tension |
| 83. | strenuous | requiring great effort |
| 84. | stressful | causing strain or pressure |
| 85. | taxing | physically or mentally draining |
| 86. | tedious | long, dull, and tiring |
| 87. | thankless | hard and unappreciated |
| 88. | thorny | full of difficulties |
| 89. | time-consuming | taking a lot of time |
| 90. | toilsome | full of hard work |
| 91. | tough | difficult and demanding |
| 92. | tricky | difficult in a complicated way |
| 93. | troublesome | causing difficulty or annoyance |
| 94. | trying | stressful and hard to bear |
| 95. | unforgiving | allowing little room for error |
| 96. | unpleasantly hard | hard in an unpleasant way |
| 97. | uphill | difficult and discouraging |
| 98. | wearing | causing fatigue over time |
| 99. | wearisome | tiring and dull |
| 100. | weighty | serious and demanding attention |
