| No. | Item | Definition |
|---|---|---|
| 1. | ambiguity | unclear meaning or situation |
| 2. | anxiety | worry caused by uncertainty |
| 3. | apprehension | anxious expectation or doubt |
| 4. | arguably | open to debate or doubt |
| 5. | at sea | confused and uncertain |
| 6. | bafflement | confused uncertainty |
| 7. | bewilderment | confused uncertainty |
| 8. | capriciousness | unpredictable changeability |
| 9. | chance | possibility without certainty |
| 10. | changeability | tendency to vary unpredictably |
| 11. | cloudiness | lack of clarity |
| 12. | conceivably | it may be possible |
| 13. | conditionally | depending on uncertain conditions |
| 14. | confoundedness | state of being perplexed |
| 15. | confusion | lack of clear understanding |
| 16. | conjecture | opinion based on incomplete evidence |
| 17. | contingency | possible future event or condition |
| 18. | dilemma | situation requiring uncertain choice |
| 19. | disorientation | loss of clear direction |
| 20. | disquiet | uneasy uncertainty |
| 21. | doubt | lack of confidence or certainty |
| 22. | doubtful outlook | future that seems uncertain |
| 23. | doubtfulness | quality of being doubtful |
| 24. | dubiety | state of doubt |
| 25. | dubiousness | quality of being doubtful |
| 26. | equivocal | open to more than one meaning |
| 27. | equivocality | quality of being ambiguous |
| 28. | equivocalness | ambiguity or uncertainty |
| 29. | fluidity | readiness to change |
| 30. | fuzziness | imprecise or unclear quality |
| 31. | gray area | unclear or undefined area |
| 32. | guesswork | reasoning without certainty |
| 33. | haziness | lack of clarity |
| 34. | hesitancy | tendency to hesitate |
| 35. | hesitation | pause from uncertainty |
| 36. | hypothesis | proposed explanation not confirmed |
| 37. | iffy | uncertain or doubtful |
| 38. | incertitude | lack of certainty |
| 39. | inconclusiveness | lack of a clear result |
| 40. | indecision | inability to decide |
| 41. | indecisiveness | habit of not deciding |
| 42. | indefiniteness | lack of exact limits |
| 43. | indeterminacy | state of being undetermined |
| 44. | insecurity | lack of confidence or assurance |
| 45. | instability | lack of steadiness or certainty |
| 46. | irresolution | uncertain or wavering state |
| 47. | limbo | state of uncertainty or neglect |
| 48. | maybe | expression of uncertainty |
| 49. | misgiving | feeling of doubt or worry |
| 50. | muddle | confused state |
| 51. | murkiness | unclear or hard to understand |
| 52. | mystification | state of being puzzled |
| 53. | nervousness | uneasy feeling from uncertainty |
| 54. | not sure | lacking certainty |
| 55. | obscurity | state of being unclear |
| 56. | on the fence | unable to decide |
| 57. | opaqueness | lack of transparency or clarity |
| 58. | open question | issue not yet settled |
| 59. | pendingness | state of awaiting decision |
| 60. | perhaps | possibly; not certainly |
| 61. | perplexity | state of being puzzled |
| 62. | possibly | with uncertainty or chance |
| 63. | precariousness | state of being uncertain or risky |
| 64. | presumption | assumption without full proof |
| 65. | provisionally | subject to later confirmation |
| 66. | puzzlement | state of uncertainty or confusion |
| 67. | question | matter open to doubt |
| 68. | questionability | state of being doubtful |
| 69. | randomness | lack of pattern or predictability |
| 70. | reservation | doubt preventing full acceptance |
| 71. | scruple | moral doubt or hesitation |
| 72. | second thoughts | renewed doubts about something |
| 73. | shakiness | lack of confidence or stability |
| 74. | skepticism | doubt about truth |
| 75. | speculation | forming ideas without certainty |
| 76. | speculativeness | based on uncertain assumptions |
| 77. | supposition | uncertain belief or assumption |
| 78. | suspense | state of anxious uncertainty |
| 79. | suspicion | feeling that something is doubtful |
| 80. | tentative state | condition lacking certainty |
| 81. | tentatively | without full certainty |
| 82. | tentativeness | lack of firmness or certainty |
| 83. | the unknown | what is not known |
| 84. | to be determined | not yet decided |
| 85. | uncertitude | state of doubt or uncertainty |
| 86. | unclearness | lack of clarity |
| 87. | unease | feeling of worry or doubt |
| 88. | unknowability | quality of being impossible to know |
| 89. | unknown | something not known |
| 90. | unpredictability | lack of reliable foreseeability |
| 91. | unsettlement | state of being unsettled |
| 92. | unsureness | state of not being sure |
| 93. | unsurety | state of being unsure |
| 94. | up in the air | still undecided or unsettled |
| 95. | vacillation | wavering between choices |
| 96. | vagueness | lack of clear detail |
| 97. | variability | likelihood of change |
| 98. | volatility | tendency to change unpredictably |
| 99. | wavering | hesitation or indecision |
| 100. | wild card | unpredictable factor |