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Douglas Harper's Etymology Dictionary
unchartered

1805, from un- (1) "not" + past participle of charter (v.).

Wiktionary
unchartered

a. Not chartered; not supplied with a charter.

WordNet
unchartered

adj. not chartered [ant: chartered]

Usage examples of "unchartered".

It is not for nothing that since pre-Christian times his family had exercised chieftainship over unchartered miles of barren moorland.