不用了。

You can use this phrase on its own or add a polite 'thank you' (xièxie) at the end. If a waiter offers more water and your glass is full, say bùyòng le. If a friend offers to drive you home but you want to walk, say bùyòng le. It is a complete sentence by itself. It works perfectly in spoken conversation and text messages.

Use it whenever someone offers you something you don't want. This includes physical items like a plastic bag at a store or services like a refill at a restaurant. It is also great for declining help with a task. If you are at a meeting and someone offers to explain a point you already understand, this is your phrase. It keeps things moving efficiently.

Do not use this if someone is asking you a 'Yes/No' question about a fact. For example, if someone asks 'Are you a student?', answering bùyòng le makes no sense. Also, avoid using it with very high-ranking officials or elders without adding a polite title. Using it alone might sound slightly too brief in very formal ceremonies. Don't use it if you actually want the thing being offered!

Chinese culture often involves a 'politeness dance.' People might offer things multiple times to show hospitality. Using bùyòng le is a standard way to decline without causing 'loss of face.' It signals that you are being self-sufficient. In many parts of China, being independent is respected. Declining help once or twice is actually expected behavior in many social circles.

You will often hear bùyòng, bùyòng (repeated twice). This sounds extra friendly and humble. You might also hear hái shì bùyòng le, which means 'Actually, I still don't need it.' This is useful if someone is being very persistent with their offer. Adding a smile makes the phrase even more effective. It turns a rejection into a pleasant social interaction.