| Clue | Source | Date |
|---|---|---|
| No quote stands up as purely intellectual | ||
| Sick note for one with cold relating to one's head | Irish Times Crosaire | 06 Sep 2019 |
| Relating to the intellect | The Times Concise | 22 Sep 2017 |
| Involving mental exercise | The Washington Post | 23 Jun 2016 |
| Of the intellect | ||
| Of the intellect | ||
| Intellectual | ||
| Based on the intellect | ||
| Originating in the intellect | ||
| Involving purely intellectual speculation | ||
| Purely intellectual | ||
| Intellectual person. | ||
| Apprehended only by the intellect. |