noun which may take the genitive case particle 'no'
unlabeled; unbranded; no mark
Describes something without a brand label, logo, or identifying mark. Often used for generic or store-brand products.
無印の商品は安くて品質も悪くない。
Unbranded products are cheap and the quality isn't bad either.
彼はいつも無印の服を着ている。
He always wears unbranded clothes.
ノーブランド is a loanword meaning 'no brand', often used for fashion or luxury items, while 無印 is a native Japanese term used more broadly for any unmarked or generic item.
Compound of 無 (mu, 'without') and 印 (shirushi, 'mark'). The reading むじるし is a straightforward combination of the on'yomi of 無 and the kun'yomi of 印.