Ý này rất tốt.

Ý means idea, point, or suggestion, depending on context.

In Ý này rất tốt, it refers to this idea or this point.

A few related words:

• ý = idea / thought
• ý kiến = opinion / view
• ý tưởng = idea / concept, often more like a creative idea

So ý này is a short, natural way to say this idea.

In Vietnamese, demonstratives like this and that usually come after the noun.

So:

• ý này = this idea
• người này = this person
• cuốn sách này = this book

This is different from English, where this comes before the noun.

A very common pattern is:

noun + này = this + noun
noun + đó / kia = that + noun

Rất means very.

So:

• tốt = good
• rất tốt = very good

In Vietnamese, degree words like rất usually come before the adjective:

• rất đẹp = very beautiful
• rất hay = very interesting / very good
• rất đúng = very correct

So the structure here is:

• ý này = this idea
• rất tốt = is very good

Vietnamese often does not use a word equivalent to English is in simple descriptions.

So:

• Ý này rất tốt literally looks like idea this very good
• but it naturally means This idea is very good

This is normal in Vietnamese. When a noun is being described by an adjective, you usually do not need a verb like to be.

Compare:

• Cô ấy đẹp = She is beautiful
• Trời nóng = The weather is hot
• Ý này rất tốt = This idea is very good

Yes, it is a complete and natural sentence.

Vietnamese often allows shorter expressions than English, especially when the context is clear. Native speakers commonly use short noun phrases like ý này if everyone already knows what idea is being discussed.

You could also say:

• Ý kiến này rất tốt = This opinion is very good
• Ý tưởng này rất tốt = This idea is very good

But Ý này rất tốt is perfectly natural in conversation.

These words are related, but not identical:

• ý = idea, point, thought; short and flexible
• ý kiến = opinion, comment, viewpoint
• ý tưởng = idea, concept, often a more developed or creative idea

So:

• Ý này rất tốt = This idea/point is very good
• Ý kiến này rất tốt = This opinion is very good
• Ý tưởng này rất tốt = This idea/concept is very good

In everyday speech, ý is often used informally as a shorter version when the meaning is obvious from context.

A rough pronunciation guide for English speakers is:

• ý ≈ like ee with a high, sharp tone
• này ≈ somewhat like nye with a falling tone
• rất ≈ roughly zut or rut, depending on dialect, with a broken/heavy tone
• tốt ≈ roughly toht with a broken/heavy tone

A few important notes:

• ý has the sắc tone: rising/sharp
• này has the huyền tone: low/falling
• rất and tốt have the nặng tone: short, low, heavy/glottalized

If you are learning Northern Vietnamese, r in rất is often pronounced like a z sound. In Southern Vietnamese, it may sound closer to r or y, depending on the speaker.

Both tốt and hay can sometimes be translated as good, but they are used differently.

• tốt = good, beneficial, positive, of good quality
• hay = interesting, clever, nice, skillful, good in a way that often means impressive or appealing

So:

• Ý này rất tốt = This idea is very good
• Ý này hay đấy = This idea is nice / clever / interesting

Sometimes both work, but the nuance changes:

• tốt focuses more on overall goodness or usefulness
• hay focuses more on being clever, interesting, or appealing

Yes. Ý này tốt lắm is natural.

Both are common:

• rất tốt = very good
• tốt lắm = very good / really good

The difference is mostly in tone and style:

• rất tốt sounds a bit more neutral or direct
• tốt lắm can feel a bit more conversational or expressive

You might also hear:

• Ý này hay lắm
• Ý này được đấy
• Ý này ổn đấy

Each has a slightly different nuance.

Not in this sentence. Here, này is just the normal demonstrative meaning this.

However, này can also be used as an attention-getter, like hey or listen, in other contexts:

• Này! = Hey!

That use can sound rude depending on tone and situation. But in Ý này rất tốt, it is simply part of ý này = this idea.

The pattern is:

noun + demonstrative + degree word + adjective

So:

• ý = idea
• này = this
• rất = very
• tốt = good

Full structure: Ý này rất tốt
= This idea is very good

You can use the same pattern with many other sentences:

• Cuốn sách này rất hay = This book is very interesting
• Món ăn này rất ngon = This dish is very tasty
• Người này rất tốt = This person is very kind/good

It is a very useful sentence pattern in Vietnamese.