Synonyms: undiscovered, unexplored
Definition: not yet discovered
Usage: undiscovered islands
Similar words: unknown
Definition: not known
Usage: an unknown amount; an unknown island; an unknown writer; an unknown source
Synonyms: undiscovered
Definition: not discovered
Usage: with earth-based telescopes many stars remain undiscovered
Similar words: undetected
Definition: not perceived or discerned
Usage: they feared some undetected trace of poison; she looked around to be sure her faux pas was undetected