noun which may take the genitive case particle 'no', noun
unknown; unidentified; not yet clarified
Formal, often used in academic or official contexts to indicate that details are not yet known or confirmed.
The purpose of the ruins is unknown.
It is a study with many unidentified points.
未詳 is a formal term meaning 'details unknown', typically used for authorship or origins, whereas 未知 is broader and covers anything not yet known or explored.
anonymous; of unknown authorship
Compound of 未 (mi, 'not yet') and 詳 (shō, 'detailed'). The reading みしょう is the on'yomi of both characters.