| No. | Item | Definition |
|---|---|---|
| 1. | acute | severe and intense |
| 2. | agonizing | causing extreme pain |
| 3. | arduous | requiring great effort |
| 4. | austere | severe and plain |
| 5. | backbreaking | extremely hard physical work |
| 6. | barbarous | extremely cruel or harsh |
| 7. | blazing | very intense or fierce |
| 8. | blistering | intensely harsh or severe |
| 9. | bone-crushing | overwhelmingly forceful or severe |
| 10. | bone-wearying | extremely tiring |
| 11. | brutal | very harsh or severe |
| 12. | burdensome | hard to carry or endure |
| 13. | ceaseless | continuing without pause |
| 14. | challenging | difficult in a demanding way |
| 15. | colossal | extremely large or demanding |
| 16. | constant | happening all the time |
| 17. | cruel | causing pain without pity |
| 18. | crushing | overwhelmingly severe or defeating |
| 19. | daunting | intimidatingly difficult |
| 20. | demanding | requiring much effort or skill |
| 21. | depleting | using up energy or resources |
| 22. | devastating | highly damaging or overwhelming |
| 23. | draining | causing great tiredness |
| 24. | drawn-out | lasting too long |
| 25. | enervating | causing weakness or fatigue |
| 26. | enfeebling | making weak or feeble |
| 27. | epic | very large and demanding |
| 28. | exacting | demanding great effort or precision |
| 29. | excruciating | extremely painful |
| 30. | exhausting | extremely tiring |
| 31. | fatiguing | causing tiredness |
| 32. | ferocious | extremely fierce or intense |
| 33. | fierce | very strong and intense |
| 34. | formidable | very difficult to overcome |
| 35. | full-on | intense and unrelenting |
| 36. | grave | serious and severe |
| 37. | grievous | very severe or serious |
| 38. | grim | stern and depressing |
| 39. | grinding | wearing down steadily |
| 40. | gruelling | extremely tiring and demanding |
| 41. | hard | difficult and severe |
| 42. | hardgoing | difficult to make progress in |
| 43. | harrowing | extremely distressing |
| 44. | harsh | severely difficult or unpleasant |
| 45. | heavy | hard to bear |
| 46. | herculean | requiring enormous strength or effort |
| 47. | implacable | unable to be softened |
| 48. | incessant | never stopping |
| 49. | inhuman | lacking compassion or kindness |
| 50. | intense | very strong or extreme |
| 51. | iron-fisted | very strict and forceful |
| 52. | iron-handed | ruthlessly strict |
| 53. | killer | extremely difficult or exhausting |
| 54. | knackering | extremely tiring or exhausting |
| 55. | laborious | requiring much effort |
| 56. | merciless | showing no mercy |
| 57. | mercilessly tough | extremely tough and unforgiving |
| 58. | monstrous | shockingly large or severe |
| 59. | murderous | extremely exhausting or severe |
| 60. | onerous | burdensome and demanding |
| 61. | oppressive | hard to bear or endure |
| 62. | overwhelming | too great to handle easily |
| 63. | painful | causing physical or emotional pain |
| 64. | persistent | continuing firmly or repeatedly |
| 65. | pitiless | showing no compassion |
| 66. | pitilessly hard | extremely hard and merciless |
| 67. | prolonged | lasting longer than usual |
| 68. | punitive | intended as punishment |
| 69. | racking | causing intense pain or strain |
| 70. | relentless | unceasing and severe |
| 71. | remorseless | without pity or regret |
| 72. | rigorous | extremely thorough and demanding |
| 73. | rough | hard and unpleasant |
| 74. | ruthless | without mercy or compassion |
| 75. | savage | fierce and very harsh |
| 76. | severe | very strict or intense |
| 77. | shattering | deeply upsetting or exhausting |
| 78. | soul-crushing | emotionally overwhelming and bleak |
| 79. | soul-destroying | emotionally crushing and draining |
| 80. | stern | serious and strict |
| 81. | stiff | severe or demanding |
| 82. | strenuous | needing great effort and energy |
| 83. | taxing | physically or mentally demanding |
| 84. | testing | challenging and demanding |
| 85. | tiresome | causing tiredness or annoyance |
| 86. | tormenting | causing severe suffering |
| 87. | torturous | involving intense pain or difficulty |
| 88. | tough | hard to endure or do |
| 89. | trying | difficult to endure |
| 90. | ultrahard | extremely hard or severe |
| 91. | unforgiving | not lenient or easy |
| 92. | unrelenting | not easing or stopping |
| 93. | unsparing | not easing severity |
| 94. | unyielding | not giving way |
| 95. | uphill | difficult and demanding |
| 96. | violent | extremely forceful or intense |
| 97. | wearing | gradually exhausting |
| 98. | wearisome | causing fatigue or boredom |
| 99. | weighty | serious and demanding |
| 100. | withering | severely damaging or scornful |