| Clue | Source | Date |
|---|---|---|
| 'No idea' | Newsday | 20 Jul 2023 |
| “I don’t know” | Wall Street Journal | 22 Mar 2021 |
| "I'm stumped!" | Eugene Sheffer | 10 Jul 2020 |
| 'I dunno' | New York Times | 27 Jul 2018 |
| "I dunno" | ||
| "Darned if I know!" | ||
| "I don't know" | ||
| "Guilty as charged" | ||
| "No clue ..." | ||
| "I'm stumped!" | ||
| "Dunno” | ||
| "Dunno" |