undocumented
//ˌʌnˈdɒkjʊmɛntɪd//
Adjective
undocumentedCanonical form
1
Not recorded or supported by official documents or written evidence.
The historian discovered several undocumented events from that era.
2
(of a person) Lacking the official documents required for legal immigration or residence.
Undocumented immigrants often face many challenges in accessing healthcare.
3
(computing) Not described in official documentation; referring to features or functions that exist but are not officially explained or supported.
The programmer discovered an undocumented feature in the software that was not mentioned in the manual.