tuya ga sukunai.

つや means gloss, luster, or shine on a surface. It is often used for things like hair, skin, paint, fabric, paper, or food—anything that can look smooth and shiny.

It is often written in kana as つや, although the kanji 艶 also exists.

Here, が marks つや as the thing being described by 少ない.

So the structure is basically:

• つや = gloss / shine
• が = subject marker
• 少ない = is little / is scarce

A natural way to understand it is: The gloss is قليلة / there is little gloss → It has little shine.

With words like ある, ない, 多い, and 少ない, が is very commonly used to mark what exists in greater or smaller quantity.

少ない is an i-adjective meaning few or little. It directly describes the amount of gloss.

• つやが少ない = there is little gloss / it is not very shiny

少し, on the other hand, is an adverb meaning a little. It usually modifies another word.

For example:

• つやが少しある = there is a little gloss
• 少しつやがある = it is a little glossy

So 少ない is the right form when you want to say the amount itself is small.

Yes. つやがない means there is no gloss / it is not glossy.

The difference is:

• つやが少ない = there is little gloss
• つやがない = there is no gloss

So 少ない is softer and allows for some shine to still be present, while ない is stronger and more absolute.

Japanese often leaves out the topic or subject when it is understood from context.

So つやが少ない。 by itself does not explicitly say what has little gloss. It could mean:

• This fabric has little sheen
• Her hair lacks luster
• The paint is not very glossy

In context, the missing topic might be something like:

• この生地は、つやが少ない。
• この髪は、つやが少ない。

So the sentence is complete in Japanese, even though English usually wants a clearer subject like it.

Yes. 少ない is an i-adjective.

That means it behaves like other i-adjectives:

• dictionary form: 少ない
• past: 少なかった
• negative: 少なくない
• polite: 少ないです

Examples:

• つやが少ない。 = It has little gloss.
• つやが少なかった。 = It had little gloss.
• つやが少ないです。 = It has little gloss. (polite)

つやが少ない。 is plain style, so it is neutral/casual.

A polite version is:

• つやが少ないです。

The plain form is common in:

• dictionary examples
• product descriptions
• written notes
• casual conversation

The です version is better in polite conversation or when speaking to customers.

Usually, learners will most often see it written as つや in everyday materials. The kanji 艶 exists, but it is less common in basic writing and can feel more literary or formal depending on context.

So all of these are possible:

• つやが少ない
• 艶が少ない

But for many learners, recognizing the kana version first is most useful.

It could, but the meaning and focus would change slightly.

• つやが少ない。
  Focuses on gloss as the thing that is in small amount.

• つやは少ない。
  Sounds more contrastive, like as for gloss, there isn’t much.

For example, if comparing features:

• 色はいいが、つやは少ない。
  The color is good, but the gloss is limited.

So が is the more natural default choice here.

It is most commonly used for visible luster or sheen, so usually something physical.

Typical uses:

• hair
• skin
• cloth
• ceramics
• paint
• food appearance

Depending on context, つや can sometimes suggest a healthy, rich, attractive surface quality rather than just literal shininess. For example, with hair or skin, it can imply healthy-looking luster.