| Clue | Source | Date |
|---|---|---|
| Stupid | Thomas Joseph | 04 Oct 2021 |
| Doltish | Thomas Joseph | 19 Jan 2021 |
| Super stubborn | Universal | 14 Sep 2018 |
| Slow on the uptake.. | Wall Street Journal | 24 Mar 2018 |
| Super stubborn | ||
| Slow-witted | USA Today | 03 Jan 2016 |
| Slow-witted | ||
| Rather dense | ||
| Dull |