| Most cells seem ready to commit to programmed cell death when faced with an unsolvable loss of matrix attachment. |
| Her echo bounced from wall to wall, penetrating his ears like an unsolvable riddle. |
| Where they came, where they went, the questions surrounding them were unsolvable mysteries. |
| Assumptions of the world as fair and manageable are shattered by an unsolvable mystery that can go on for a lifetime. |
| I think this is an unsolvable problem, and I might start with an attempted proof of its unsolvability rather than a solution. |
| We can see symptoms of this when specialists get bogged down in apparently unsolvable general questions. |
