| No. | Term | Definition |
|---|---|---|
| 1. | A bit unsure | Not completely certain. |
| 2. | A mystery to me | I have no idea. |
| 3. | Above my pay grade | Not for me to decide. |
| 4. | All I can say is… | I can’t confirm details. |
| 5. | Anyone’s guess | No one knows for sure. |
| 6. | Beats me | I don’t know. |
| 7. | Beyond me | I can’t understand it. |
| 8. | Can’t say | I don’t know or won’t say. |
| 9. | Can’t say for sure | Not certain. |
| 10. | Can’t tell | I can’t determine that. |
| 11. | Couldn’t tell you | I don’t know. |
| 12. | Difficult to say | Hard to determine. |
| 13. | Don’t ask me | I don’t know. |
| 14. | Don’t have a clue | I don’t know at all. |
| 15. | Don’t have the answer | I can’t answer that. |
| 16. | Don’t know | I’m not sure. |
| 17. | Drawing a blank | I can’t recall. |
| 18. | Dunno | I don’t know. |
| 19. | Escapes me | I can’t remember. |
| 20. | Far as I know, no | Not to my knowledge. |
| 21. | Far as I know, yes | To my knowledge, yes. |
| 22. | For all I know | Possibly, but I’m unsure. |
| 23. | Got me | I don’t know. |
| 24. | Hard to tell | Unclear right now. |
| 25. | Haven’t a clue | I don’t know at all. |
| 26. | Haven’t the faintest | No idea whatsoever. |
| 27. | I can’t confirm that | I’m not sure it’s true. |
| 28. | I can’t help there | I don’t know. |
| 29. | I can’t place it | I can’t remember where. |
| 30. | I can’t recall | I don’t remember. |
| 31. | I can’t say | I don’t know or won’t. |
| 32. | I can’t speak to that | I lack knowledge on it. |
| 33. | I can’t tell | I can’t determine it. |
| 34. | I couldn’t say | I don’t know. |
| 35. | I don’t have that info | I lack the information. |
| 36. | I don’t know either | I also don’t know. |
| 37. | I don’t know yet | Not determined yet. |
| 38. | I don’t remember | I can’t recall. |
| 39. | I don’t rightly know | I’m not sure. |
| 40. | I have no clue | I don’t know at all. |
| 41. | I have no idea | I don’t know. |
| 42. | I haven’t checked | I don’t know yet. |
| 43. | I haven’t heard | I’m not aware. |
| 44. | I haven’t looked | I don’t know yet. |
| 45. | I haven’t the foggiest | No idea at all. |
| 46. | I’ll find out | I will check and report. |
| 47. | I’ll get back to you | I’ll check and respond later. |
| 48. | I’m at a loss | I don’t know what to say. |
| 49. | I’m in the dark | I’m not informed. |
| 50. | I’m not aware | I don’t know about that. |
| 51. | I’m not certain | I’m unsure. |
| 52. | I’m not convinced | I’m not sure it’s true. |
| 53. | I’m not in the loop | I’m not informed. |
| 54. | I’m not positive | I’m not sure. |
| 55. | I’m not sure | I’m uncertain. |
| 56. | I’m out of the loop | I’m not informed. |
| 57. | I’m stumped | I can’t figure it out. |
| 58. | If I had to guess | This is only a guess. |
| 59. | It rings no bell | I don’t recognize it. |
| 60. | It’s anyone’s guess | No one knows. |
| 61. | It’s beyond me | I can’t understand it. |
| 62. | It’s hard to say | Uncertain. |
| 63. | It’s not clear | Uncertain or ambiguous. |
| 64. | It’s not my area | Not my expertise. |
| 65. | It’s unclear | Not certain. |
| 66. | Let me check | I’ll look it up. |
| 67. | Let me confirm | I’ll verify. |
| 68. | Let me find out | I’ll investigate. |
| 69. | Let me get back | I’ll respond later. |
| 70. | Let’s see | I need to check. |
| 71. | No clue | No idea. |
| 72. | No idea | I don’t know. |
| 73. | Not a clue | No idea. |
| 74. | Not in my wheelhouse | Not my expertise. |
| 75. | Not on my radar | I wasn’t aware. |
| 76. | Not sure | Uncertain. |
| 77. | Not that I know of | To my knowledge, no. |
| 78. | Out of my depth | Beyond my knowledge. |
| 79. | Pass | I can’t answer. |
| 80. | Search me | I don’t know. |
| 81. | That’s a good question | I don’t know right now. |
| 82. | That’s beyond my scope | Outside my responsibility. |
| 83. | That’s not my call | Not my decision. |
| 84. | That’s not my field | Not my expertise. |
| 85. | That’s unclear | Not certain. |
| 86. | That’s unknown | Not known. |
| 87. | There’s no telling | Impossible to know now. |
| 88. | Too early to say | Not enough information yet. |
| 89. | Unclear to me | I’m uncertain. |
| 90. | Unknown to me | I don’t know. |
| 91. | Wish I knew | I don’t know. |
| 92. | Wouldn’t know | I don’t know. |
| 93. | Your guess is as good | I don’t know either. |
| 94. | Zany as it sounds, unsure | I’m uncertain. |
| 95. | Zapped from memory | I can’t recall. |
| 96. | Zebra’s guess | Just a guess. |
| 97. | Zen says: I don’t know | I don’t know. |
| 98. | Zero idea | No idea at all. |
| 99. | Zettabytes away from me | Far beyond my knowledge. |
| 100. | Zilch | Nothing; no idea. |