| No. | Item | Definition |
|---|---|---|
| 1. | absolutely | completely; without any doubt |
| 2. | actually | in fact; indeed |
| 3. | as sure as anything | certainly; definitely |
| 4. | as sure as day | certainly; definitely |
| 5. | as sure as death | certainly; inevitably |
| 6. | as sure as eggs | certainly; definitely |
| 7. | as sure as fate | certainly; inevitably |
| 8. | as sure as hell | certainly; emphatically |
| 9. | as sure as shooting | certainly; definitely |
| 10. | as sure as sunrise | certainly; definitely |
| 11. | as sure as taxes | certainly; inevitably |
| 12. | assured | confident; certain |
| 13. | assuredly | in a sure way |
| 14. | beyond a doubt | without doubt |
| 15. | beyond a shadow | with no doubt at all |
| 16. | beyond all doubt | without doubt |
| 17. | beyond all question | without question |
| 18. | beyond any doubt | without any doubt |
| 19. | beyond any question | without question |
| 20. | beyond any shadow | with no doubt at all |
| 21. | beyond argument | not arguable |
| 22. | beyond dispute | not disputable |
| 23. | beyond doubt | with complete certainty |
| 24. | beyond question | without any question |
| 25. | by all means | certainly; go ahead |
| 26. | categorically | in an absolute way |
| 27. | certain | definite; not doubtful |
| 28. | clearly | obviously; without doubt |
| 29. | conclusively | in a decisive way |
| 30. | confidently | with certainty |
| 31. | convincedly | with firm belief |
| 32. | count on it | be sure it will happen |
| 33. | decidedly | definitely; unquestionably |
| 34. | definitely | without doubt; for sure |
| 35. | evidently | apparently; clearly |
| 36. | for certain | for sure; without doubt |
| 37. | for sure | without doubt |
| 38. | forsooth | indeed; certainly |
| 39. | frankly | to be honest; indeed |
| 40. | guaranteed | certain to happen |
| 41. | I’m certain | I am sure |
| 42. | I’m positive | I am sure |
| 43. | I’m sure | I am certain |
| 44. | in fact | indeed; actually |
| 45. | in no uncertain terms | very clearly; definitely |
| 46. | in point of fact | in fact; indeed |
| 47. | in truth | truly; indeed |
| 48. | inarguably | not open to dispute |
| 49. | incontestably | not able to be denied |
| 50. | indeed | in fact; certainly |
| 51. | indisputably | not able to be disputed |
| 52. | indubitably | without doubt |
| 53. | irrefutably | impossible to disprove |
| 54. | make no mistake | be certain of this |
| 55. | mark my words | remember this; it will happen |
| 56. | naturally | as expected; of course |
| 57. | no bones about it | plainly; without hesitation |
| 58. | no doubt | certainly; very likely |
| 59. | no ifs or buts | without argument; certainly |
| 60. | no problem | certainly; it’s fine |
| 61. | no question | certainly; without doubt |
| 62. | no shadow of doubt | no doubt at all |
| 63. | not a doubt | no doubt at all |
| 64. | not at all | certainly; no trouble |
| 65. | not by any means | certainly not |
| 66. | not in the least | not at all; certainly not |
| 67. | obviously | in an evident way |
| 68. | of course | as expected; certainly |
| 69. | plainly | clearly; unmistakably |
| 70. | positively | definitely; without doubt |
| 71. | promise | a firm assurance |
| 72. | really | in truth; indeed |
| 73. | rest assured | be confident; be sure |
| 74. | sure | certain; yes |
| 75. | surely | without doubt; certainly |
| 76. | take it from me | trust me; it’s true |
| 77. | to be certain | to be sure |
| 78. | to be honest | indeed; frankly |
| 79. | to be sure | certainly; admittedly |
| 80. | to my certain knowledge | as far as I know |
| 81. | to my knowledge | as far as I know |
| 82. | truly | really; genuinely |
| 83. | trust me | believe me; it’s true |
| 84. | unambiguously | in a clear, single meaning |
| 85. | unarguably | not open to argument |
| 86. | undeniably | in a way not deniable |
| 87. | undoubtedly | without any doubt |
| 88. | unequivocally | without ambiguity |
| 89. | unmistakably | in a way not misunderstood |
| 90. | unquestionably | beyond question |
| 91. | verily | truly; certainly |
| 92. | without a doubt | without doubt |
| 93. | without doubt | with no uncertainty |
| 94. | without exception | in every case |
| 95. | without fail | certainly; without exception |
| 96. | without question | without doubt |
| 97. | yes | an affirmative reply |
| 98. | you bet | certainly; yes |
| 99. | you betcha | certainly; yes |
| 100. | you can be sure | it is certain |