Com muito barulho, não dá para entender direito.

Não dá para + infinitive is a very common Brazilian Portuguese structure meaning it’s not possible to..., you can’t..., or it’s hard/impossible to... in a given situation.

So here, não dá para entender direito means something like:

• you can’t understand properly
• it’s not possible to understand clearly
• it’s hard to make things out

It is an impersonal expression, so it does not need a specific subject like I, you, or we.

Because dar in this expression is being used impersonally. The verb stays in the 3rd person singular:

• dá para entender
• não dá para ouvir
• deu para resolver
• vai dar para chegar

There is no real grammatical subject here. It works a bit like English it’s possible to..., where it does not refer to anything specific.

Com muito barulho means with a lot of noise or when there is a lot of noise.

Here, com introduces the condition or circumstance that makes understanding difficult. It sets the scene:

• Com muito barulho, não dá para entender direito.
• Literally: With a lot of noise, it’s not possible to understand properly.

In natural English, this often becomes:

• When there’s a lot of noise, you can’t understand properly.

So com is not always just a simple with in a physical sense. It can also mean under these conditions.

Because the sentence is meant to be general, not tied to one person.

Portuguese often uses impersonal structures when talking about what is possible or impossible in general. Instead of saying:

• Você não consegue entender direito
• A gente não consegue entender direito

the speaker says:

• Não dá para entender direito

That makes it broader: anyone in that situation would have trouble understanding.

Here direito means properly, correctly, or clearly.

It is very common in Brazilian Portuguese to use direito in this way:

• Não entendi direito. = I didn’t understand properly / clearly.
• Não ouvi direito. = I didn’t hear properly.
• Leia direito. = Read carefully / properly.

So in this sentence, entender direito means to understand clearly/properly, not to understand rights/law or anything related to the noun direito.

Because direito is very natural and idiomatic in everyday Brazilian Portuguese.

Compare:

• não dá para entender direito = very natural, conversational
• não dá para entender claramente = understandable, but less everyday in this context

A native speaker would very often choose direito in speech because it sounds more natural and less formal.

Because para here introduces the action that is or isn’t possible. After para, Portuguese commonly uses the infinitive:

• dá para fazer
• dá para ver
• não dá para ouvir
• não dá para entender

So não dá para entender literally follows the pattern it doesn’t give for understanding, but in real meaning it is it’s not possible to understand.

Yes. In spoken Brazilian Portuguese, pra is extremely common:

• Com muito barulho, não dá pra entender direito.

This is probably what you would hear most often in conversation.
Para is the full form and is perfectly correct; it may feel a little more neutral or careful in writing.

Because Com muito barulho is an introductory phrase that gives the context for the rest of the sentence.

The comma helps separate:

• the condition/circumstance: Com muito barulho
• the main statement: não dá para entender direito

In short sentences like this, the comma is very natural and helps readability. In informal writing, some people might omit it, but using it here is standard and clear.

Literally, entender means to understand. But in a sentence about noise, it can imply that you can’t make out what is being said clearly.

So depending on context, English might translate it as:

• understand properly
• make out what people are saying
• hear clearly enough to understand

If the speaker wanted to focus only on the physical act of hearing, they might use ouvir:

• Com muito barulho, não dá para ouvir direito.

But entender adds the idea of comprehension, not just sound reaching your ears.

Yes. Não é possível entender direito is grammatically correct and means almost the same thing.

But there is a difference in tone:

• Não dá para entender direito = more common, conversational, everyday Brazilian Portuguese
• Não é possível entender direito = a bit more formal or explicit

In casual speech, não dá para is extremely frequent.

They are similar, but barulho is more common in everyday speech.

• barulho = noise, racket, disturbance
• ruído = noise, but often sounds more technical, formal, or specific

For example:

• Tem muito barulho aqui. = very natural everyday Portuguese
• Há muito ruído no sinal. = more technical, like signal interference

In this sentence, barulho is the most natural choice.

Yes. You could also say:

• Não dá para entender direito com muito barulho.

This means the same thing. The difference is mainly in emphasis:

• Com muito barulho, não dá para entender direito.
  Emphasizes the noisy condition first.
• Não dá para entender direito com muito barulho.
  States the problem first, then adds the cause.

Both are natural. The original version sounds very good when the speaker wants to frame the situation first.

The sentence is understandable throughout the Portuguese-speaking world, but não dá para + infinitive is especially common and characteristic of everyday Brazilian Portuguese usage.

A European Portuguese speaker would understand it, but some expressions and frequency of use may differ. For a learner focusing on Brazilian Portuguese, this is a very useful and natural pattern to learn.