| No. | Item | Definition |
|---|---|---|
| 1. | all-important | more important than everything else |
| 2. | axial | forming a central axis |
| 3. | backbone | chief support or main strength |
| 4. | basic | forming the essential foundation |
| 5. | bedrock | fundamental and firmly established |
| 6. | big | important or significant |
| 7. | cardinal | of basic and greatest importance |
| 8. | central | at the core; highly important |
| 9. | chief | highest in importance |
| 10. | conclusive | serving to settle the matter |
| 11. | consequential | important in effect or result |
| 12. | core | central and most important |
| 13. | critical | vitally important to the outcome |
| 14. | crucial | extremely important or decisive |
| 15. | deciding | settling the outcome or issue |
| 16. | decisive | settling an issue or result |
| 17. | defining | shaping essential character or outcome |
| 18. | determinative | deciding the final outcome |
| 19. | dominant | most important or controlling |
| 20. | effective | successful in producing a result |
| 21. | enormous | very great in importance |
| 22. | epochal | highly important in history |
| 23. | essential | completely necessary; very important |
| 24. | exceptional | unusually important or notable |
| 25. | far-reaching | having wide important effects |
| 26. | fateful | having decisive important consequences |
| 27. | first-order | of the highest importance |
| 28. | foremost | most important or prominent |
| 29. | formative | shaping later development importantly |
| 30. | fundamental | forming the basic foundation |
| 31. | game-changing | causing a major shift |
| 32. | governing | having the main determining influence |
| 33. | grave | very serious or important |
| 34. | groundbreaking | introducing important new developments |
| 35. | heart | most important central part |
| 36. | heavy | serious in importance or effect |
| 37. | high-stakes | involving serious consequences |
| 38. | highly significant | very important or meaningful |
| 39. | hinge | acting as a turning point |
| 40. | historic | important in history or development |
| 41. | imperative | absolutely necessary or urgent |
| 42. | indispensable | too important to do without |
| 43. | influential | having strong effect on others |
| 44. | instrumental | important in making something happen |
| 45. | integral | necessary to make whole |
| 46. | key | most important or essential |
| 47. | keystone | central supporting element |
| 48. | landmark | notably important and influential |
| 49. | leading | most important or influential |
| 50. | life-and-death | extremely serious and crucial |
| 51. | linchpin | holding everything important together |
| 52. | main | chief in importance |
| 53. | major | very important or significant |
| 54. | make-or-break | decisive for success or failure |
| 55. | material | important and relevant to outcome |
| 56. | meaningful | having serious importance or value |
| 57. | mission-critical | essential for success or operation |
| 58. | momentous | very important and far-reaching |
| 59. | monumental | extremely important or great |
| 60. | necessary | required for a result |
| 61. | needed | required or very important |
| 62. | nodal | serving as a central point |
| 63. | notable | worthy of attention; important |
| 64. | noteworthy | deserving attention for importance |
| 65. | of consequence | important enough to matter |
| 66. | of moment | important or significant |
| 67. | operative | producing the main effect |
| 68. | outstanding | exceptionally important or good |
| 69. | overriding | more important than other concerns |
| 70. | paramount | more important than anything else |
| 71. | pathbreaking | opening important new directions |
| 72. | pressing | demanding immediate serious attention |
| 73. | primary | first in importance or rank |
| 74. | prime | first in importance |
| 75. | principal | first in importance |
| 76. | prominent | important and well known |
| 77. | radical | fundamental and far-reaching |
| 78. | remarkable | unusually important or striking |
| 79. | requisite | officially required or necessary |
| 80. | revolutionary | causing dramatic important change |
| 81. | root | basic and central |
| 82. | ruling | having controlling importance |
| 83. | salient | most noticeable and important |
| 84. | seminal | strongly influencing later developments |
| 85. | serious | important and needing attention |
| 86. | signal | notably important or remarkable |
| 87. | significant | important enough to matter greatly |
| 88. | sine qua non | an essential condition |
| 89. | strategic | important to long-term success |
| 90. | supreme | highest in importance or authority |
| 91. | telling | revealing or strongly influential |
| 92. | top-priority | deserving the most attention |
| 93. | transformative | causing major important change |
| 94. | turning-point | marking a decisive change |
| 95. | ultimate | last and most important |
| 96. | underlying | basic and important beneath surface |
| 97. | urgent | needing prompt action or attention |
| 98. | vital | absolutely necessary or important |
| 99. | watershed | marking an important turning point |
| 100. | weighty | having great importance or influence |