| Clue | Source | Date |
|---|---|---|
| There's six feet of water missing - it's inexplicable! (10) | ||
| Tom flashes which is incomprehensible (10) | ||
| Disguised hamlet of special German police force is impenetrable (10) | ||
| Impossible to understand | Newsday | 05 Feb 2023 |
| Can't figure out what's below, as it knows no bounds | Irish Times Crosaire | 15 Sep 2017 |
| Duff flashes Tom with description of 14 down | Irish Times Crosaire | 07 Apr 2015 |
| Immeasurable | ||
| Incomprehensible. |