also: あんのーん
noun which may take the genitive case particle 'no', na-adjective, noun-modifying (irregular), noun
Used as a noun or adjectival noun to describe something or someone whose identity, nature, or details are not known. Often appears in contexts like 'unknown author', 'unknown cause', or 'unknown number'.
犯人はまだアンノウンです。
The culprit is still unknown.
アンノウンなウイルスが検出された。
An unknown virus was detected.
Standard katakana spelling for the English loanword 'unknown'.
Variant katakana spelling reflecting a more elongated final vowel; less common.
不明 is a more formal, native Japanese term for 'unknown' or 'unclear', often used in official contexts, while アンノウン is a direct loanword with a slightly more casual or technical feel.
未知 means 'not yet known' or 'unexplored', emphasizing something that has not been discovered or experienced, whereas アンノウン simply states that something is not identified.
Borrowed from English 'unknown'.