This inner area is sealed off by doors that have remained undiscovered.

The thief set off the alarms, but these were ignored as false, and the theft remained undiscovered until 8:20 AM.

I still can't understand how the place could have remained undiscovered.

Then his mind told him once again that such speculation was an impossible luxury, and he bent all his effort to remaining undiscovered.

If there is a more peaceful place in the central city, it remains thus far undiscovered.

For five years, both the killer and his loot had remained undiscovered.

Crime - until now - had remained undiscovered.

The original French text of Mirbeau's essay has remained undiscovered to this day.

If they had never met, their talent would have remained latent and undiscovered.

It relied almost entirely upon luck: that is to say-upon one vital piece of evidence remaining undiscovered.