| Answer | Crossword Clue |
|---|---|
| unrealizable | Not able to be achieved or made to happen |
| realizable | Able to be achieved or made to happen |
| possible | Able to happen although not certain to; denoting a fact, event, or situation that may or may not occur or be so |
| unattainable | Not able to be reached or achieved |
| unrepeatable | Not able to be done or made again |
| unbridgeable | (of a gap or difference) Not able to be bridged or made less significant |
