na-adjective
cannot be ordered; unavailable for order
Used in commercial contexts to indicate that an item or service cannot be ordered, often due to being out of stock, discontinued, or not offered.
この商品は現在注文不可です。
This product cannot be ordered at the moment.
メニューに「注文不可」と書いてある料理は、材料が入らないそうです。
I heard that the dishes marked 'unavailable' on the menu are out of ingredients.
Compound of 注文 (order) + 不可 (not possible, cannot).