| No. | Item | Definition |
|---|---|---|
| 1. | accident-prone | likely to lead to accidents |
| 2. | aggressive | ready to attack or harm |
| 3. | alarming | causing fear of danger |
| 4. | arduous | difficult and risky |
| 5. | at risk | in danger of harm |
| 6. | baleful | threatening harm or evil |
| 7. | baneful | causing harm or ruin |
| 8. | belligerent | hostile and threatening |
| 9. | bloodcurdling | terrifyingly dangerous |
| 10. | breakneck | dangerously fast or reckless |
| 11. | brutal | harsh and dangerous |
| 12. | calamitous | bringing disaster or misery |
| 13. | chancy | full of risk |
| 14. | charged | filled with tense danger |
| 15. | contagious | able to spread disease |
| 16. | corrosive | able to burn or destroy |
| 17. | critical | dangerously serious or unstable |
| 18. | dangerous | likely to cause harm |
| 19. | deadly | likely to cause death |
| 20. | death-defying | extremely dangerous |
| 21. | deleterious | causing harm or damage |
| 22. | destructive | causing great damage |
| 23. | dicey | somewhat dangerous or uncertain |
| 24. | dire | extremely serious or urgent |
| 25. | disastrous | causing great harm |
| 26. | endangered | seriously at risk |
| 27. | epidemic | spreading dangerously widely |
| 28. | explosive | likely to erupt violently |
| 29. | exposed | left unprotected from danger |
| 30. | fatal | causing death or disaster |
| 31. | fateful | having serious dangerous consequences |
| 32. | fearsome | causing fear or danger |
| 33. | ferocious | violently dangerous |
| 34. | formidable | inspiring fear or caution |
| 35. | fraught | filled with danger or trouble |
| 36. | grave | seriously dangerous or severe |
| 37. | hairy | dangerous or difficult |
| 38. | harmful | causing damage or injury |
| 39. | harrowing | extremely distressing and dangerous |
| 40. | hazard-filled | full of hazards |
| 41. | hazardous | full of risk or danger |
| 42. | high-risk | involving great danger |
| 43. | hostile | unfriendly and threatening |
| 44. | ill-fated | doomed to bad results |
| 45. | ill-starred | likely to end badly |
| 46. | imperiled | put in danger |
| 47. | in jeopardy | in danger or at risk |
| 48. | infectious | capable of spreading infection |
| 49. | injurious | causing harm or damage |
| 50. | killer | extremely dangerous or deadly |
| 51. | knife-edge | extremely dangerous or uncertain |
| 52. | lethal | capable of causing death |
| 53. | life-threatening | seriously risking death |
| 54. | loaded | full of hidden danger |
| 55. | malignant | very harmful or dangerous |
| 56. | menacing | suggesting serious danger |
| 57. | mortal | causing or risking death |
| 58. | murderous | capable of killing |
| 59. | noxious | harmful or poisonous |
| 60. | ominous | giving a sense of danger |
| 61. | on a knife-edge | in extreme danger or uncertainty |
| 62. | on dangerous ground | in a risky situation |
| 63. | on thin ice | in a risky situation |
| 64. | pathogenic | capable of causing disease |
| 65. | pernicious | very harmful in a gradual way |
| 66. | pitched on a precipice | placed in grave danger |
| 67. | poisonous | capable of causing poisoning |
| 68. | precarious | dangerously unstable or uncertain |
| 69. | punishing | severely demanding or harmful |
| 70. | radioactive | dangerously emitting radiation |
| 71. | rife with danger | full of danger |
| 72. | risk-laden | full of risk |
| 73. | risky | involving possible danger or loss |
| 74. | rough | harsh and potentially dangerous |
| 75. | ruinous | causing severe damage or loss |
| 76. | savage | fierce and dangerous |
| 77. | septic | infected and dangerous |
| 78. | serious | dangerously important or severe |
| 79. | shaky | unstable and unsafe |
| 80. | sinister | suggesting evil or danger |
| 81. | stormy | violent and dangerous |
| 82. | thorny | difficult and risky to handle |
| 83. | threatened | under danger or risk |
| 84. | threatening | showing possible danger or harm |
| 85. | ticklish | difficult and potentially risky |
| 86. | touch-and-go | very uncertain and risky |
| 87. | toxic | poisonous and harmful |
| 88. | treacherous | dangerous in a deceptive way |
| 89. | tricky | difficult and risky |
| 90. | uncertain | not reliably safe or sure |
| 91. | under threat | facing possible harm |
| 92. | unsafe | not safe or secure |
| 93. | unsound | not safe or reliable |
| 94. | unstable | not steady or secure |
| 95. | violent | using or involving force |
| 96. | virulent | extremely harmful or dangerous |
| 97. | volatile | likely to change dangerously |
| 98. | vulnerable | open to harm or attack |
| 99. | white-knuckle | causing intense fear or risk |
| 100. | wild | uncontrolled and dangerous |