not marked on a map; that has not been visited or investigated before 地图上未绘出(或未标明)的 The ship hit an uncharted rock. 船撞在海图上未标示的岩石上。 They set off into the country's uncharted interior. 他们出发前往这个国家人迹罕至的内陆。 - (figurative)
The party is sailing in uncharted waters (= a situation it has not been in before). 这个党面临一种崭新的局势。 - (figurative)
I was moving into uncharted territory (= a completely new experience) with this relationship. 这个关系让我开始有全新的体验。