undocumented
adjective C1- Lacking instructions or reference material. · Undocumented software can be very difficult to learn to use.
- Not having official documents that provide identification, authorization, etc.
- Not having official documentation required to legally enter, reside in, or work in a country. · undocumented immigrant
From the library
As they traversed the sweeping expanses of the Great Plains and the formidable elevations of the Rocky Mountains, they painstakingly recorded hundreds of previously undocumented species.
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