| Clue | Source | Date |
|---|---|---|
| Impediment to innovation | Newsday | 20 Apr 2024 |
| Having one broken digit in railway termini can cause stiffness | ||
| Stiffness | The Telegraph Quick | 21 Dec 2017 |
| Unbending nature | The Times Concise | 24 Jul 2017 |
| Inflexibility, stiffness | Irish Times Simplex | 02 Aug 2016 |
| Inability to bend | The Times Concise | 11 Sep 2015 |
| Firmness | ||
| Strictness. |