| No. | Item | Definition |
|---|---|---|
| 1. | adamant | firm and impossible to persuade |
| 2. | assertive | confidently firm |
| 3. | authoritative | confident and firm in manner |
| 4. | bent on | firmly resolved to do |
| 5. | bullheaded | stubborn and unreasonable |
| 6. | cast-iron | extremely firm and reliable |
| 7. | ceaseless | continuing without stopping |
| 8. | commanding | showing authority and firmness |
| 9. | committed | firmly dedicated to something |
| 10. | constant | unchanging and steady |
| 11. | controlled | kept firmly in check |
| 12. | dauntless | not easily frightened or discouraged |
| 13. | decisive | showing firm judgment |
| 14. | dedicated | devoted to a purpose |
| 15. | deep-rooted | firmly established over time |
| 16. | defiant | openly resisting authority |
| 17. | determined | having a firm purpose |
| 18. | disciplined | showing controlled firmness |
| 19. | dogged | showing stubborn persistence |
| 20. | driven | strongly motivated and determined |
| 21. | dug in | firmly entrenched in position |
| 22. | embedded | firmly fixed within something |
| 23. | enduring | lasting and persistent |
| 24. | entrenched | firmly established and hard to change |
| 25. | faithful | steady and loyal |
| 26. | fearless | showing no fear |
| 27. | firm | strong and steady in purpose |
| 28. | fixed | firmly set and unchanging |
| 29. | forceful | strong and assertive |
| 30. | granite | hard and unmovable in attitude |
| 31. | hard to move | difficult to persuade or shift |
| 32. | hard to sway | not easily influenced |
| 33. | hard-edged | tough and unsentimental |
| 34. | hard-line | strict and unwilling to compromise |
| 35. | hard-nosed | tough and unsentimental |
| 36. | hard-set | firmly fixed or determined |
| 37. | harsh | severe and unsoftened |
| 38. | headstrong | stubbornly determined |
| 39. | hell-bent | determined to do something |
| 40. | holding fast | remaining firmly attached |
| 41. | immovable | unable to be moved or changed |
| 42. | immutable | unchanging over time |
| 43. | implacable | unable to be softened |
| 44. | indomitable | impossible to defeat or subdue |
| 45. | inexorable | impossible to stop or persuade |
| 46. | inflexible | not willing to bend or change |
| 47. | ingrained | deeply fixed and hard to change |
| 48. | intent | firmly focused on purpose |
| 49. | intransigent | refusing compromise or agreement |
| 50. | invariable | never changing |
| 51. | iron-willed | having very strong will |
| 52. | locked in | firmly fixed and settled |
| 53. | loyal | firm in support or allegiance |
| 54. | merciless | showing no mercy |
| 55. | mulish | stubborn like a mule |
| 56. | nonnegotiable | not open to compromise |
| 57. | not budging | refusing to move or change |
| 58. | not giving an inch | refusing any concession |
| 59. | obdurate | stubbornly refusing to change |
| 60. | persevering | continuing steadily despite obstacles |
| 61. | persistent | continuing firmly despite difficulty |
| 62. | pigheaded | stubbornly unreasonable |
| 63. | purposeful | having clear determination |
| 64. | recalcitrant | resisting authority or control |
| 65. | refractory | stubbornly resistant to control |
| 66. | relentless | not easing or giving up |
| 67. | resistant | opposing change or influence |
| 68. | resolute | firmly determined |
| 69. | resolved | firmly decided |
| 70. | rigid | not flexible in thought or form |
| 71. | rock-ribbed | very firm and conservative |
| 72. | rock-solid | extremely firm and dependable |
| 73. | rooted | firmly established |
| 74. | self-willed | determined to do as one wants |
| 75. | set | firmly decided |
| 76. | settled | fixed and not likely changing |
| 77. | severe | harsh and uncompromising |
| 78. | single-minded | focused and unwavering in purpose |
| 79. | staunch | loyal and firm |
| 80. | steadfast | firm and unwavering |
| 81. | steely | hard, cold, and determined |
| 82. | stern | serious and strict |
| 83. | stiff | not easily bent or changed |
| 84. | strong-willed | having a forceful will |
| 85. | stubborn | fixed in opinion or purpose |
| 86. | tenacious | holding firmly and persistently |
| 87. | tough-minded | practical and unsentimental |
| 88. | unalterable | unable to be changed |
| 89. | unbending | not yielding to pressure |
| 90. | unchangeable | not able to change |
| 91. | uncompromising | not making concessions |
| 92. | undaunted | not discouraged by difficulty |
| 93. | undeviating | not turning from course |
| 94. | unfaltering | steady and not weakening |
| 95. | unflinching | not shrinking from difficulty |
| 96. | unmodifiable | not able to be modified |
| 97. | unrelenting | not becoming less severe |
| 98. | unswerving | not turning aside from course |
| 99. | unwavering | steady and not faltering |
| 100. | willful | stubbornly self-willed |
