Nie chcę dziś marudzić, ale ta głośność jest naprawdę za duża.

In this sentence, marudzić means something like to grumble, to complain, to whine, or to fuss.

So Nie chcę dziś marudzić is roughly:

• I don’t want to complain today
• I don’t want to grumble today

It is a real and fairly common Polish word, but its tone can feel a bit more informal and slightly more emotional than a neutral verb like narzekać (to complain). It can suggest that someone is being fussy or complaining in an annoying way.

So:

• marudzić = to whine / grumble / fuss
• narzekać = to complain, more neutral

Chcę is the 1st person singular present tense form of chcieć (to want).

So:

• chcieć = to want
• chcę = I want
• nie chcę = I do not want

This is just an irregular verb form that needs to be learned.

A few forms of chcieć:

• chcę = I want
• chcesz = you want
• chce = he/she/it wants
• chcemy = we want
• chcecie = you (plural) want
• chcą = they want

So Nie chcę dziś marudzić literally means I do not want today to complain.

Because after chcieć (to want), Polish usually uses the infinitive of the second verb.

So the pattern is:

• chcę + infinitive = I want to ...
• nie chcę + infinitive = I don’t want to ...

Examples:

• Chcę spać. = I want to sleep.
• Nie chcę iść. = I don’t want to go.
• Nie chcę dziś marudzić. = I don’t want to complain today.

This works very similarly to English want to + verb.

Yes, dziś (today) can move around, because Polish word order is more flexible than English word order.

In this sentence:

• Nie chcę dziś marudzić = I don’t want to complain today

You could also hear:

• Dziś nie chcę marudzić
• Nie chcę marudzić dziś

All of these are understandable, but they may place slightly different emphasis on the sentence.

The version in your example, Nie chcę dziś marudzić, sounds very natural and neutral.

Also, dziś and dzisiaj both mean today.

• dziś is a little shorter and very common
• dzisiaj is also completely normal

Ale means but.

The sentence has two parts:

1. Nie chcę dziś marudzić = I don’t want to complain today
2. ale ta głośność jest naprawdę za duża = but this volume/loudness is really too high

So ale connects the two ideas:

• I don’t want to complain, but...

This is a very common way to soften criticism in both Polish and English.

Głośność means loudness or volume, depending on context.

In this sentence, it most naturally means:

• the volume
• the loudness level

So ta głośność is something like:

• this volume
• this loudness

The noun comes from głośny (loud).

Related words:

• głośny = loud
• głośno = loudly / loud
• głośność = loudness / volume

In everyday speech, Polish speakers might also say:

• Ta muzyka jest za głośna. = This music is too loud.
• To jest za głośne. = This is too loud.
• Ta głośność jest za duża. = This volume is too high.

Because głośność is a feminine noun, and the demonstrative this must agree with it.

In Polish:

• ten = this (masculine)
• ta = this (feminine)
• to = this (neuter)

Since głośność is feminine, we use ta:

• ta głośność = this volume/loudness

More examples:

• ten problem = this problem
• ta muzyka = this music
• to okno = this window

The ending -ość often appears in feminine abstract nouns, and głośność is one of them.

Because the adjective has to agree with głośność, which is feminine.

So:

• głośność = feminine
• therefore duża = feminine form of big/large

Agreement looks like this:

• duży = masculine
• duża = feminine
• duże = neuter

So:

• ten problem jest za duży = this problem is too big
• ta głośność jest za duża = this volume is too high/too loud
• to okno jest za duże = this window is too big

Even though English says too loud or too high, Polish often uses za duży with nouns like głośność:

• literally: too big
• naturally: too high / too much

Here, za means too.

So:

• za duża = too big / too high
• za głośna = too loud
• za późno = too late
• za drogie = too expensive

This is a very common Polish structure:

• za + adjective/adverb

Examples:

• To jest za trudne. = This is too difficult.
• On mówi za szybko. = He speaks too fast.
• Muzyka jest za głośna. = The music is too loud.

So in your sentence, za duża means that the volume is higher than it should be.

Naprawdę means really.

It adds emphasis:

• jest za duża = is too high
• jest naprawdę za duża = is really too high

So it makes the complaint stronger, but still natural.

Examples:

• To jest naprawdę dobre. = This is really good.
• On jest naprawdę miły. = He is really nice.
• To jest naprawdę za głośne. = This is really too loud.

Yes, it is natural.

Nie chcę dziś marudzić, ale ta głośność jest naprawdę za duża. sounds like a polite, slightly soft way to say that something is too loud.

That said, native speakers might also say similar things in other ways, for example:

• Nie chcę narzekać, ale jest naprawdę za głośno.
  = I don’t want to complain, but it’s really too loud.

• Nie chcę marudzić, ale to jest za głośne.
  = I don’t want to complain, but this is too loud.

• Nie chcę się czepiać, ale ta muzyka jest za głośna.
  = I don’t want to nitpick, but this music is too loud.

Your original sentence is perfectly fine; it is just a bit more focused on the volume level itself.

Because Polish can describe the problem in two different ways:

1. By talking about the thing:

   • Muzyka jest za głośna. = The music is too loud.

2. By talking about the level/amount of loudness:

   • Głośność jest za duża. = The volume/loudness is too high.

So:

• za głośna describes something as loud
• za duża describes the amount/level as excessive

English often prefers too loud, while Polish can naturally use either structure depending on what the speaker wants to focus on.

A few things may stand out for English speakers:

• chcę
  The cluster chc- can feel difficult at first. Try to say it smoothly as one unit.

• dziś
  The dź/ź/ś-type sounds are softer than typical English sounds. dziś is roughly one syllable, and the final ś is a soft sh-like sound.

• marudzić
  The dz in -dzić is part of a soft consonant sound.

• głośność
  This has several sounds that may be new:

  • ł sounds like English w
  • ś is soft
  • ść at the end is a consonant cluster that takes practice

A rough pronunciation guide:

• Nie chcę dziś marudzić, ale ta głośność jest naprawdę za duża
• approximately: Nyeh htsenj jish mah-ROO-jich, AH-leh tah GWOHSHNoshch yest nap-RAWV-deh zah DOO-zhah

That is only approximate, but it may help you notice the tricky parts.