| No. | Item | Definition |
|---|---|---|
| 1. | accountable | responsible and answerable |
| 2. | advisable | worth doing; recommended |
| 3. | all-important | extremely necessary or important |
| 4. | answerable | required to explain or justify |
| 5. | appropriate | right or suitable here |
| 6. | apt | suitable or fitting |
| 7. | basic | forming an essential foundation |
| 8. | beneficial | helpful or advantageous |
| 9. | binding | officially required or enforceable |
| 10. | bound to | required or certain to |
| 11. | called for | needed in the situation |
| 12. | called on | asked or required to act |
| 13. | called upon | required to act or serve |
| 14. | commanded | required by authority |
| 15. | compulsory | required; not optional |
| 16. | counted on | relied on as necessary |
| 17. | critical | extremely important at this point |
| 18. | crucial | extremely important for success |
| 19. | de rigueur | socially required or expected |
| 20. | deemed necessary | judged to be needed |
| 21. | demanded | required forcefully or clearly |
| 22. | depended on | needed for support or success |
| 23. | dictated | required by circumstances or rules |
| 24. | drawn on | used when needed |
| 25. | driven | compelled by need or pressure |
| 26. | duty-bound | required by duty |
| 27. | enjoined | officially directed or required |
| 28. | entailed | involved as a necessity |
| 29. | essential | absolutely needed; very important |
| 30. | expected | regarded as required or normal |
| 31. | fit | suitable for the purpose |
| 32. | fitting | suitable for the situation |
| 33. | functional | working and useful |
| 34. | fundamental | basic and necessary |
| 35. | grave | serious and important |
| 36. | have to | be required to |
| 37. | helpful | providing needed assistance |
| 38. | high-priority | needing attention before others |
| 39. | imperative | absolutely necessary right now |
| 40. | imposed | required by authority |
| 41. | in order | necessary or appropriate |
| 42. | in requisition | officially required or demanded |
| 43. | incumbent | necessary as a duty |
| 44. | indicated | shown as necessary or suitable |
| 45. | indispensable | too important to do without |
| 46. | instrumental | important in making happen |
| 47. | integral | necessary to make whole |
| 48. | invaluable | extremely useful or important |
| 49. | irreplaceable | impossible to replace |
| 50. | justified | shown to be necessary |
| 51. | key | very important or necessary |
| 52. | looked to | relied on or expected |
| 53. | major | important or significant |
| 54. | mandatory | required by rule or law |
| 55. | material | important and relevant |
| 56. | mission-critical | essential for core operations |
| 57. | momentous | very important and consequential |
| 58. | must-have | something highly necessary |
| 59. | necessary | needed to achieve something |
| 60. | necessitated | made necessary by circumstances |
| 61. | needful | necessary or required |
| 62. | nonnegotiable | not optional; required |
| 63. | obligatory | required by duty or rule |
| 64. | obliged | required by duty or thanks |
| 65. | of the essence | critically important now |
| 66. | operative | working or in effect |
| 67. | ordered | officially required or commanded |
| 68. | paramount | more important than others |
| 69. | pivotal | centrally important |
| 70. | prescribed | set as required |
| 71. | pressed | urgently required or requested |
| 72. | pressing | needing quick action |
| 73. | primary | first in importance |
| 74. | principal | main or most important |
| 75. | proper | correct or suitable |
| 76. | recommended | suggested as a good choice |
| 77. | relied on | depended on as necessary |
| 78. | required | necessary by rule or need |
| 79. | requisite | officially or practically required |
| 80. | resorted to | used when necessary |
| 81. | salient | most noticeable and important |
| 82. | significant | important enough to matter |
| 83. | sine qua non | essential condition or thing |
| 84. | sought | looked for or needed |
| 85. | specified | clearly stated as required |
| 86. | stipulated | specifically required or stated |
| 87. | suitable | right for a purpose |
| 88. | supposed to | expected or required to |
| 89. | unavoidable | impossible to avoid |
| 90. | urgent | requiring immediate attention |
| 91. | usable | able to be used |
| 92. | useful | helpful for a purpose |
| 93. | valued | considered important or useful |
| 94. | vital | extremely important or necessary |
| 95. | wanted | desired or needed |
| 96. | warranted | justified or required by circumstances |
| 97. | weighty | serious and important |
| 98. | well-suited | very suitable for something |
| 99. | workable | capable of working well |
| 100. | worthwhile | valuable enough to do |

