uncharted Definition

1a. Said of territory, etc: not fully explored or mapped in detail;

Thesaurus: unknown, unexplored, undiscovered, strange, new, novel, virgin, foreign; Antonym: familiar, well known.
1b. Said of territory, etc: not shown on a map or chart.
2. Said of a non-physical area, a subject area, etc: not yet examined or fully investigated.