1 non standard (of an area of land or sea) not mapped or surveyed.‘these are unchartered waters’
unexplored, untravelled, undiscovered, unresearched, unplumbed, unfamiliar, unknown, strange
- ‘it's safe to say the finance sector is in unchartered territory’
2Not having a charter or written constitution.
unskilled, untaught, non-technical, unschooled, untutored, unpractised, inexperienced, unequipped, unversed, uninformed, unacquainted
- ‘Only 2.9 percent of Missouris cities are constitutionally chartered, and two thirds of current eminent domain cases involve unchartered municipalities.’
The original meaning of unchartered is ‘not having a charter or written constitution’, but most modern examples are in the sense ‘not mapped or surveyed’, which arose through being confused with uncharted. Despite its wide currency this use is regarded by many as a mistake