noun which may take the genitive case particle 'no', noun
unsigned; unattributed
Describes a document, work, or statement that lacks a signature or named attribution. Often used in formal or journalistic contexts.
その投書は無署名だった。
The letter to the editor was unsigned.
無署名の記事が新聞に載った。
An unattributed article appeared in the newspaper.
Compound of 無 (mu, 'without') and 署名 (shomei, 'signature'). The reading is the standard on'yomi combination.