kono syouhin ha misiyou desu.

It’s read:

この しょうひん は みしよう です。

In normal writing, it would usually appear without spaces:

この商品は未使用です。

A natural pronunciation is roughly:

kono shōhin wa mishiyō desu

A few pronunciation notes:

• 商品 = しょうひん
• 未使用 = みしよう
• The particle は is written ha but pronounced wa in this sentence.

Because は is being used as a particle, specifically the topic marker.

When は is part of a word, it is usually pronounced ha.
But when it functions as the topic particle, it is pronounced wa.

So:

• この商品は = As for this product, ...

This is one of the first pronunciation exceptions Japanese learners encounter.

この means this, but it must be followed by a noun.

So:

• この商品 = this product

You cannot use この by itself. Compare:

• これ = this / this one
• この商品 = this product

So if you want to say this product, この is correct because it directly modifies 商品.

Because これ and この work differently:

• これ is a standalone pronoun: this / this one
• この must come before a noun: this + noun

So:

• これです。 = This is it.
• この商品です。 = This is the product. / This product ...

Since 商品 is a noun right after it, you need この, not これ.

商品 means product/item/goods, and は marks it as the topic of the sentence.

So この商品は means something like:

• As for this product, ...
• This product ...

Japanese often sets up a topic first and then says something about it.

So the structure is:

• この商品 = this product
• は = topic marker
• 未使用です = is unused

Japanese sentence structure is different from English.

In this sentence, the copula comes at the end:

• 未使用です

The です part is what gives the sentence its polite is/am/are feeling.

So even though Japanese does not match English word-for-word, the whole sentence works like:

• This product is unused.

Japanese often puts the most important descriptive part near the end.

未使用 is a very common formal word meaning unused.

It is built from:

• 未 = not yet / un-
• 使用 = use / usage

So literally it has the sense of:

• not used
• unused

Grammatically, words like this often behave like noun-like / na-adjective-like terms in Japanese. That is why they can be followed directly by です:

• 未使用です = is unused

This kind of wording is especially common in:

• product listings
• ads
• store descriptions
• online marketplaces
• labels

Because 未使用 is the predicate here — it is what is being said about the product.

So:

• この商品は未使用です。 = This product is unused.

But when 未使用 directly modifies a noun, you usually use の:

• 未使用の商品 = an unused product

So compare:

• この商品は未使用です。 = This product is unused.
• これは未使用の商品です。 = This is an unused product.

That is a very important distinction.

Yes, but it means something slightly different in structure.

• この商品は未使用です。
  = This product is unused.

• 未使用の商品です。
  = It is an unused product. / This is an unused product.

In the original sentence, 未使用 is the description at the end.
In 未使用の商品, 未使用 is directly modifying 商品 with の.

So both are natural, but they are built differently.

です makes the sentence polite.

So:

• この商品は未使用です。 = polite
• この商品は未使用だ。 = plain / less polite
• この商品は未使用。 = very casual / clipped, often in speech or notes

In product descriptions and customer-facing language, です is very common because it sounds polite and neutral.

Yes, very natural.

It sounds especially natural in contexts like:

• online shopping
• secondhand sales
• auction listings
• product descriptions
• store explanations

It has a slightly formal, factual tone.

For example, a seller might write:

• この商品は未使用です。 = This item is unused.

It sounds more like listing language than casual everyday conversation.

They are similar, but not always identical.

• 未使用 = unused
• 新品 = brand-new / new item

An item can be 未使用 because it has never been used, but depending on context it may not necessarily be sold as brand-new in the strict retail sense. For example, it might be an older item, opened but never used, or a resale item.

So in sales language:

• 新品 often emphasizes new condition
• 未使用 emphasizes has not been used

Sometimes both may apply, but they are not perfect synonyms.

You could, but は is more natural in a basic statement like this.

• この商品は未使用です。
  = As for this product, it is unused.
  This is the normal neutral statement.

• この商品が未使用です。
  = This product is the one that is unused.
  This can sound more emphatic or contrastive, depending on context.

So unless you specifically need emphasis or contrast, は is the safer choice here.

The spaces are just for learners.

Normal Japanese writing usually does not use spaces between words, so the sentence would normally be written as:

この商品は未使用です。

Textbooks and beginner materials sometimes add spaces to make word boundaries easier to see.

Yes, depending on context.

For example:

• この商品は未使用。

This can sound casual, brief, or label-like. You might see that in notes, ads, or informal speech.

But:

• この商品は未使用です。

is the safer standard polite form, especially for learners.

Both can express a similar idea, but they feel different.

• 未使用です = concise, formal, listing-style
• 使っていません = more verbal and conversational, literally has not been used / I am not using it depending on context

For product descriptions, 未使用です is much more natural and compact.

So in a listing, Japanese often prefers the short formal label-like expression:

• 未使用
• 新品
• 美品
• 中古

This is one reason the sentence sounds very natural in a sales context.