Nie cierpię, kiedy ktoś mówi zbyt głośno przez telefon.

No. In this sentence, nie cierpię is an idiomatic expression meaning I can’t stand or I really hate.

The verb cierpieć literally means to suffer, but in the negative form nie cierpieć it often means to detest / to be unable to stand something.

So:

• Cierpię. = I am suffering.
• Nie cierpię tego. = I can’t stand that.

In everyday Polish, nie cierpię is very natural for strong annoyance.

Cierpię is the 1st person singular present tense form of cierpieć.

The subject is understood as I, so Polish does not need the pronoun ja here.

Conjugation of cierpieć in the present tense:

• (ja) cierpię = I suffer / I can’t stand
• (ty) cierpisz = you suffer
• (on/ona/ono) cierpi = he/she/it suffers
• (my) cierpimy = we suffer
• (wy) cierpicie = you all suffer
• (oni/one) cierpią = they suffer

So Nie cierpię... simply means I can’t stand...

Because kiedy ktoś mówi zbyt głośno przez telefon is a subordinate clause.

Polish normally uses a comma before conjunctions that introduce subordinate clauses, including:

• kiedy = when
• że = that
• bo = because
• jeśli = if

So the structure is:

• Nie cierpię, kiedy...
• I can’t stand it when...

This comma is standard and expected in Polish spelling.

Here kiedy is best understood as when in the general sense, often close to whenever in English.

The sentence is not about one specific moment. It expresses a general reaction:

• Nie cierpię, kiedy ktoś mówi zbyt głośno przez telefon.
• I can’t stand it when someone talks too loudly on the phone.

So even though Polish uses kiedy, the meaning is habitual or general.

You could also sometimes hear gdy in similar sentences. It is a near-equivalent of when, but kiedy is very common and natural here.

Mówi is used because the sentence describes an ongoing action or a general behavior: someone is talking / someone talks.

A few contrasts:

• mówić = to speak, to talk
• powiedzieć = to say, to say once, to complete an utterance
• rozmawiać = to have a conversation, to talk with someone

So:

• ktoś mówi zbyt głośno = someone speaks too loudly
• ktoś powie would sound like someone says / will say something once, which does not fit as well
• ktoś rozmawia przez telefon is also possible, but it focuses more on having a phone conversation

The original sentence focuses on the annoying behavior of speaking too loudly, so mówi is a very good choice.

Because głośno is an adverb, and it modifies the verb mówi.

In English, compare:

• a loud person → adjective
• to speak loudly → adverb

In Polish:

• głośny = loud (adjective)
• głośno = loudly / loud (adverb)

So:

• głośny telefon = a loud phone
• mówi głośno = speaks loudly

Since the sentence describes how someone speaks, Polish uses the adverb głośno.

Both can mean too loudly, but there is a nuance.

• za głośno = the most common everyday way to say too loudly
• zbyt głośno = also too loudly, but often sounds a bit more formal, careful, or measured

So:

• Mówisz za głośno. = You’re talking too loudly.
• Mówisz zbyt głośno. = You’re speaking too loudly.
  Slightly more polished or restrained in tone.

In your sentence, zbyt głośno sounds natural and a little less blunt than za głośno.

In Polish, przez telefon literally means something like through the telephone, but idiomatically it means on the phone / over the phone.

This is a normal Polish expression.

Examples:

• Rozmawiam przez telefon. = I’m talking on the phone.
• Załatwiliśmy to przez telefon. = We handled it over the phone.

So in your sentence:

• mówi zbyt głośno przez telefon = talks too loudly on the phone

Even though English uses on, Polish uses przez here.

Yes, Polish word order is fairly flexible, though some versions sound more natural than others.

The original:

• Nie cierpię, kiedy ktoś mówi zbyt głośno przez telefon.

This is neutral and natural.

Possible variations:

• Nie cierpię, kiedy ktoś przez telefon mówi zbyt głośno.
• Nie cierpię, kiedy przez telefon ktoś mówi zbyt głośno.

These are understandable, but the original sounds the most straightforward and natural in everyday speech.

Polish often changes word order for emphasis, but for learners, the original order is the safest choice.

It normally expresses a general habit or repeated situation, not just something happening right now.

Even though the verbs are in the present tense:

• nie cierpię
• mówi

the meaning is general:

• I can’t stand it when someone talks too loudly on the phone.

If you wanted to talk about something happening right now, you would usually need more context, for example:

• Nie cierpię, kiedy ktoś tak mówi przez telefon. = I can’t stand it when someone talks like that on the phone.
• or something more direct about the present situation

So as written, the sentence is best understood as a general complaint.

Yes. Nie znoszę is a very common alternative and also means I can’t stand.

Compare:

• Nie cierpię, kiedy ktoś mówi zbyt głośno przez telefon.
• Nie znoszę, kiedy ktoś mówi zbyt głośno przez telefon.

Both are natural.

A rough feeling difference:

• nie cierpię can sound a bit stronger or more expressive
• nie znoszę is also strong, but very common in everyday speech

Both are good to know, and both fit this sentence well.