| Clue | Source | Date |
|---|---|---|
| Completely certain | The Washington Post Sunday | 29 Aug 2021 |
| “I’m confident of that” | Wall Street Journal | 18 Apr 2020 |
| Brimming with confidence | Newsday | 17 Aug 2019 |
| Positive | Newsday | 19 Feb 2015 |
| Positive | ||
| Not at all doubtful | ||
| "Oh, that's definite" |