| No. | Item | Definition |
|---|---|---|
| 1. | acid test | a conclusive test of worth |
| 2. | adversity | a period of difficulty or misfortune |
| 3. | argument | a verbal disagreement |
| 4. | assessment | an evaluation or test |
| 5. | assignment | a task given to someone |
| 6. | attempt | an effort to do something |
| 7. | baptism of fire | a first severe test |
| 8. | barrier | something that blocks movement |
| 9. | battle | a fight against opposition |
| 10. | big ask | a demanding request or task |
| 11. | bind | a difficult situation to escape |
| 12. | booby trap | a hidden danger or trick |
| 13. | brain-teaser | a tricky problem to solve |
| 14. | burden | a heavy load or responsibility |
| 15. | call-out | a public challenge to someone |
| 16. | charge | a demanding task or duty |
| 17. | clash | a conflict between opposing sides |
| 18. | competition | a contest between rivals |
| 19. | complication | an added difficulty or problem |
| 20. | conflict | a serious disagreement or struggle |
| 21. | confrontation | a direct clash or dispute |
| 22. | contest | a competition for a prize |
| 23. | danger | the possibility of harm |
| 24. | dare | a provocation to do something risky |
| 25. | demand | a difficult requirement |
| 26. | difficulty | something hard to do |
| 27. | dilemma | a choice between hard options |
| 28. | duel | a one-on-one contest |
| 29. | effort | hard work toward a result |
| 30. | encumbrance | a burden that slows progress |
| 31. | endeavor | a serious effort or attempt |
| 32. | enterprise | a bold or complex project |
| 33. | exam | a formal test of knowledge |
| 34. | expectation | a standard to be met |
| 35. | face-off | a direct confrontation or contest |
| 36. | fight | an effort against resistance |
| 37. | fix | a difficult situation |
| 38. | gauntlet | a bold test or provocation |
| 39. | glitch | a small fault causing trouble |
| 40. | goal | an aim to be achieved |
| 41. | hang-up | a problem that delays progress |
| 42. | hard row | a difficult course of action |
| 43. | hardship | a condition that is hard to bear |
| 44. | hazard | a danger or risky situation |
| 45. | head-scratcher | a puzzling problem |
| 46. | hindrance | something that makes progress harder |
| 47. | hitch | a minor problem or delay |
| 48. | hurdle | a barrier to overcome |
| 49. | impediment | something that hinders progress |
| 50. | initiative | a new plan or effort |
| 51. | issue | a problem needing attention |
| 52. | jam | a difficult situation |
| 53. | litmus test | a decisive test of quality |
| 54. | match | a competitive game or contest |
| 55. | minefield | a situation full of hidden dangers |
| 56. | mission | an important assigned task |
| 57. | objective | a target to accomplish |
| 58. | obstacle | something that blocks progress |
| 59. | opposition | resistance against someone or something |
| 60. | ordeal | a severe or painful experience |
| 61. | pickle | a troublesome situation |
| 62. | pitfall | a hidden danger or difficulty |
| 63. | predicament | a difficult, unpleasant situation |
| 64. | pressure | demands that create difficulty |
| 65. | problem | a matter needing a solution |
| 66. | project | a planned piece of work |
| 67. | puzzle | a problem that is hard to solve |
| 68. | quandary | a state of uncertainty or difficulty |
| 69. | quarrel | an angry disagreement |
| 70. | quest | a long search or pursuit |
| 71. | race | a competition of speed or progress |
| 72. | riddle | a puzzling question or problem |
| 73. | risk | a chance of loss or harm |
| 74. | roadblock | something that stops progress |
| 75. | rough patch | a period of difficulty |
| 76. | row | a noisy argument |
| 77. | showdown | a decisive confrontation |
| 78. | snag | an unexpected problem or obstacle |
| 79. | snare | a trap or tricky situation |
| 80. | strain | pressure that makes things difficult |
| 81. | stress test | a test under heavy strain |
| 82. | stretch | a demanding effort beyond comfort |
| 83. | struggle | a hard effort against difficulty |
| 84. | stumbling block | something that causes difficulty |
| 85. | tall order | a very difficult request |
| 86. | task | a piece of work to do |
| 87. | test | a trial of ability or quality |
| 88. | tight spot | a difficult situation |
| 89. | tough nut | a hard problem to solve |
| 90. | tournament | a series of competitive contests |
| 91. | trial | a test of endurance or ability |
| 92. | tryout | a test of ability for selection |
| 93. | ultimatum | a final, demanding challenge |
| 94. | uncertainty | a situation that tests confidence |
| 95. | undertaking | a task or enterprise |
| 96. | unease | a troubling, challenging feeling |
| 97. | unpleasantness | a disagreeable, challenging situation |
| 98. | uphill battle | a very difficult struggle |
| 99. | upset | a disturbing, challenging event |
| 100. | venture | a risky or daring undertaking |