Another word for undiscovered

That would be reason enough why the bones went undiscovered for four decades.

I've killed hundreds to keep you safe and undiscovered, and I'll kill hundreds more.

Filicales and Gymnosperms, and known as the Cycadofihices, a group in which, curiously enough, the reproductive organs remained undiscovered for some time after the anatomy of the vegetative organs was sufficiently well known to afford clear evidence of their true affinities.

He left the library and Traveled to one of the remaining, undiscovered safe houses at the base of one of the mountains.

This assumes that every philosophical truth is already contained somewhere in the existing systems. If, however, as it would surely be rash to deny, there still remains philosophical truth undiscovered, but discoverable by human intelligence, it is evident that eclecticism is not the only philosophy.