1. The longer a breach goes undiscovered, the more damage an attacker can do.

2. The page was under an alias and the pledge went undiscovered for a day.

3. When the researchers investigated the physical properties of the ground, they suspected that there might be an undiscovered monument beneath.

4. When the undiscovered tombs those that do exist are unearthed, they may not hold their original occupants.

5. The scan found a series of previously undiscovered defects.

6. Part of the reason the lions have gone undiscovered for so long by outsiders is that the area is rarely visited.