| Clue | Source | Date |
|---|---|---|
| Sullen sorts | New York Times | 20 Sep 2025 |
| Spiritless persons | ||
| Sullen sorts | Wall Street Journal | 10 Jun 2021 |
| Sulkers | Canadiana | 04 Jun 2018 |
| Ones with a lot of down time? | New York Times | 19 Mar 2016 |
| Sulky sorts | ||
| Blue bunch | ||
| They're blue | ||
| Dull, spiritless people | ||
| Downcast ones | ||
| Listless ones. | ||
| Sulkers. |