| No. | Item | Definition |
|---|---|---|
| 1. | adamant | unshakably firm |
| 2. | airtight | leaving no doubt |
| 3. | apparent | clearly visible or understood |
| 4. | assertive | confidently forceful |
| 5. | at ease | comfortable and relaxed |
| 6. | authoritative | commanding confidence |
| 7. | balanced | stable and sensible |
| 8. | bold | confident and fearless |
| 9. | bound | certain to happen |
| 10. | bulletproof | highly secure or convincing |
| 11. | buoyed | lifted in confidence |
| 12. | cast-iron | extremely reliable or certain |
| 13. | categorical | absolute and without doubt |
| 14. | certain | sure or definite |
| 15. | certified | officially confirmed |
| 16. | clear | free from uncertainty |
| 17. | commanding | inspiring confidence and respect |
| 18. | conclusive | serving to settle doubt |
| 19. | confident | feeling sure of oneself |
| 20. | confirmed | made certain |
| 21. | convinced | completely persuaded |
| 22. | decided | clear and definite |
| 23. | decisive | settling an issue clearly |
| 24. | definite | clear and certain |
| 25. | dependable | able to be relied on |
| 26. | destined | certain to occur |
| 27. | determined | firmly decided |
| 28. | direct | straightforward and clear |
| 29. | easy | relaxed and confident |
| 30. | emboldened | made more confident |
| 31. | encouraged | made more confident |
| 32. | established | firmly recognized as true |
| 33. | even-tempered | calm and steady |
| 34. | evident | plainly seen or understood |
| 35. | explicit | fully and clearly stated |
| 36. | fearless | showing no fear |
| 37. | firm | steady and confident |
| 38. | fixed | firmly set |
| 39. | foolproof | unlikely to fail |
| 40. | forceful | strong and confident |
| 41. | forthright | direct and straightforward |
| 42. | frank | open and direct |
| 43. | grounded | stable and sensible |
| 44. | guaranteed | promised with certainty |
| 45. | heartened | made more hopeful |
| 46. | hopeful | feeling confident about future |
| 47. | imperturbable | not easily upset |
| 48. | inarguable | not open to argument |
| 49. | incontestable | not open to dispute |
| 50. | indubitable | too certain to doubt |
| 51. | inevitable | sure to happen |
| 52. | intent | firmly focused |
| 53. | ironclad | very secure or binding |
| 54. | irrefutable | impossible to disprove |
| 55. | levelheaded | sensible and calm |
| 56. | locked in | firmly decided |
| 57. | manifest | clear to see |
| 58. | masterful | showing great confidence |
| 59. | nailed down | made certain |
| 60. | obvious | easy to see |
| 61. | optimistic | expecting good results |
| 62. | patent | openly obvious |
| 63. | persuaded | led to believe firmly |
| 64. | placid | calm and untroubled |
| 65. | plain | clear and obvious |
| 66. | plainspoken | direct and confident |
| 67. | poised | calm and self-possessed |
| 68. | positive | fully certain |
| 69. | promised | certain to happen |
| 70. | proven | shown to be true |
| 71. | quiet | calm and settled |
| 72. | reassured | made less worried |
| 73. | reliable | dependably true or steady |
| 74. | resolved | firmly determined or certain |
| 75. | rock-solid | extremely secure or certain |
| 76. | sanguine | confidently optimistic |
| 77. | satisfied | convinced or certain |
| 78. | self-possessed | calmly confident |
| 79. | sewn up | virtually certain |
| 80. | solid | firm and dependable |
| 81. | steadfast | firm and loyal |
| 82. | steady | firm and unwavering |
| 83. | substantiated | supported with evidence |
| 84. | sure | free from doubt |
| 85. | surefire | certain to succeed |
| 86. | trustworthy | deserving confidence |
| 87. | unambiguous | clear and definite |
| 88. | undeniable | impossible to doubt |
| 89. | undoubted | not questioned or uncertain |
| 90. | unequivocal | leaving no doubt |
| 91. | unfazed | not disturbed or worried |
| 92. | unquestionable | beyond doubt |
| 93. | unshaken | not made uncertain |
| 94. | untroubled | free from worry or doubt |
| 95. | unwavering | steady and firm |
| 96. | unyielding | not giving way |
| 97. | validated | proved sound or acceptable |
| 98. | verified | checked and confirmed |
| 99. | warranted | officially guaranteed |
| 100. | watertight | secure against challenge |