Korisnik je ljut zbog kvara.

Korisnik most often means user or customer/client, depending on context.

• In a tech context: user
• In a service/business context: customer or client

It is a masculine singular noun in the nominative case here, because it is the subject of the sentence.

Je is the 3rd person singular present tense of biti (to be).

So:

• korisnik = the user/customer
• je = is
• ljut = angry

Together: Korisnik je ljut = The user/customer is angry

In Serbian, this je is normally required in a sentence like this.

Because ljut agrees with korisnik, which is masculine singular.

Serbian adjectives agree with the noun in gender, number, and case.

Here are the basic forms:

• ljut = masculine singular
• ljuta = feminine singular
• ljuto = neuter singular
• ljuti = masculine plural
• ljute = feminine plural

So:

• Korisnik je ljut. = The male user/customer is angry.
• Korisnica je ljuta. = The female user/customer is angry.

Zbog means because of, due to, or on account of.

It introduces the reason for something.

So:

• ljut zbog kvara = angry because of the breakdown/fault

It is very common in Serbian when you want to give a reason with a noun phrase rather than a full clause.

Because the preposition zbog requires the genitive case.

The base form is:

• kvar = fault, malfunction, breakdown

After zbog, it changes to the genitive singular:

• zbog kvara = because of the fault/breakdown

So this is a classic case-governed pattern:

• zbog + genitive

Kvar usually refers to a fault, malfunction, or breakdown, especially of a machine, device, system, or service.

Common translations include:

• fault
• malfunction
• breakdown

Examples:

• kvar na računaru = a computer malfunction
• kvar na mreži = a network outage/fault
• zbog kvara = because of the malfunction

It usually refers to something technical or operational, not a human mistake.

Because Serbian does not have articles like English a/an/the.

So korisnik can mean:

• a user
• the user

And kvar can mean:

• a fault
• the fault

The exact meaning depends on context.

That is why Korisnik je ljut zbog kvara can be understood as:

• The user is angry because of the malfunction, or
• A user is angry because of a malfunction

depending on the situation.

Grammatically, yes, the sentence uses masculine forms:

• korisnik
• ljut

This can refer to:

1. an actual male person, or
2. a generic person if the context uses the masculine as a general form

If you want to make it clearly feminine, you would say:

• Korisnica je ljuta zbog kvara.

So the sentence as written is grammatically masculine.

Yes, you could, but there is a nuance.

• ljut = angry, annoyed
• besan = angry, furious, enraged

Besan is usually stronger than ljut.

So:

• Korisnik je ljut zbog kvara. = The user is angry/upset because of the malfunction.
• Korisnik je besan zbog kvara. = The user is furious because of the malfunction.

Both are correct, but ljut is more neutral here.

This is a very useful distinction.

• ljut zbog + genitive = angry because of something
• ljut na + accusative = angry at someone/something

Examples:

• Korisnik je ljut zbog kvara.
  The user is angry because of the malfunction.

• Korisnik je ljut na operatera.
  The user is angry at the operator.

You can even combine them:

• Korisnik je ljut na operatera zbog kvara.
  The user is angry at the operator because of the malfunction.

Yes, but the structure changes.

• zbog is followed by a noun phrase
• jer introduces a full clause

So:

• Korisnik je ljut zbog kvara.
  The user is angry because of the malfunction.

But with jer, you would say something like:

• Korisnik je ljut jer je došlo do kvara.
  The user is angry because a malfunction occurred.

Or:

• Korisnik je ljut jer sistem ne radi.
  The user is angry because the system is not working.

So you cannot normally say jer kvara.
Use zbog + noun or jer + clause.

Yes. Serbian word order is more flexible than English, although not completely free.

The neutral order here is:

• Korisnik je ljut zbog kvara.

But other orders are possible for emphasis, for example:

• Zbog kvara je korisnik ljut.
• Ljut je korisnik zbog kvara.

These may sound more marked or stylistically different, depending on context.

For a learner, the safest and most natural version is the original:

• Korisnik je ljut zbog kvara.

A simple pronunciation guide:

• Korisnik ≈ KO-ri-sneek
• je ≈ yeh
• ljut ≈ roughly lyoot
• zbog ≈ zbog (with a real z+b cluster)
• kvara ≈ KVA-ra

A rough whole-sentence approximation:

KO-ri-sneek yeh lyoot zbohg KVA-ra

A couple of notes:

• j in Serbian is pronounced like English y in yes
• lj is a special sound, roughly like ly
• Stress is not marked in normal writing, so learners usually pick it up through listening

Yes, it is natural and correct.

It sounds like something you might see in:

• customer support notes
• service reports
• business communication
• example sentences in language learning

It is concise and neutral in tone. If you wanted a more conversational version, you might also hear longer sentences like:

• Korisnik je ljut zbog ovog kvara.
• Korisnik je ljut jer problem još nije rešen.

But the original sentence is perfectly normal.