Undocumented
/əˈndɑkjəmɛntɪd/
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Definition
(adj) Lacking instructions or reference material.
Sentence Examples
It's not a bug, it's an undocumented feature.
This isn't a bug, it's an undocumented enhancement.
CEFR Practice Quiz
The researchers found several ____ species of plants during their long expedition into the deep forest today.