Jamstveni rok više ne vrijedi.

Jamstveni rok is a fixed expression meaning the warranty period or guarantee period.

• jamstveni = relating to a warranty/guarantee
• rok = period, deadline, term

So jamstveni rok is the whole noun phrase, and rok is the main noun.

Because jamstveni is an adjective agreeing with rok.

Here, rok is:

• masculine
• singular
• nominative (because it is the subject of the sentence)

So the adjective must match it:

• jamstveni rok

If the noun changed, the adjective would change too.

više ne means no longer or not anymore.

This is a very common Croatian pattern:

• više by itself often means more
• but više ne together means no longer

So in this sentence, više ne vrijedi = is no longer valid / no longer applies.

Because when više is used together with ne, it usually does not mean more in the literal quantity sense.

Compare:

• više novca = more money
• više ne radi = he/she no longer works

So in your sentence, više ne functions as a set expression meaning not anymore.

Here vrijedi means is valid, applies, or holds true.

The verb is vrijediti.

This verb can have several related meanings, such as:

• to be valid
• to apply
• to be worth

In this sentence, with jamstveni rok, the meaning is clearly to be valid / to still apply.

Yes. vrijedi is 3rd person singular present tense of vrijediti.

It matches the subject jamstveni rok, which is singular.

So literally the structure is:

• jamstveni rok = subject
• više ne vrijedi = no longer is valid

Because Croatian does not use articles like the or a/an.

So:

• rok can mean a period, the period, or just period, depending on context
• jamstveni rok can mean a warranty period or the warranty period

The exact interpretation comes from context, not from an article.

Because rok is the subject of the sentence.

In Croatian, the subject is normally in the nominative case.

So:

• jamstveni rok = nominative subject
• vrijedi = verb agreeing with that subject

Yes, that is understandable, but više ne vrijedi is the more natural way to express no longer as a single idea.

Compare:

• više ne vrijedi = standard, natural no longer applies
• ne vrijedi više = also possible, but the focus may feel slightly different, more like it doesn’t apply anymore

So for learners, više ne + verb is a very useful pattern to remember.

Yes, if the context already makes the subject clear.

Croatian often leaves out things that are understood from context. So if everyone already knows you are talking about the warranty period, you can simply say:

• Više ne vrijedi.

That means It no longer applies / It is no longer valid.

There are other ways you may hear similar ideas.

For example:

• garancijski rok = also used for warranty period
• Jamstvo više ne vrijedi. = The warranty is no longer valid
• Garancija više ne vrijedi. = same idea, with a loanword

In standard Croatian, jamstvo and jamstveni are often preferred, but in everyday speech many people also use garancija and garancijski.

No. vrijediti has more than one meaning.

Common uses include:

• This ticket is valid → Karta vrijedi
• It is worth 10 euros → Vrijedi 10 eura
• That rule applies → To pravilo vrijedi

So the exact meaning depends on the noun or context. With jamstveni rok, the natural meaning is is valid / still applies.

They are related, but not identical.

• jamstvo = the warranty / guarantee itself
• jamstveni rok = the warranty period, the length of time during which the warranty is valid

So:

• Jamstvo više ne vrijedi = the warranty is no longer valid
• Jamstveni rok više ne vrijedi is less literally the warranty period is no longer valid, but in practice it means the warranty period has expired / no longer applies

The consonant cluster is a bit tricky for English speakers.

A rough guide:

• jamstveni ≈ YAHM-stveh-nee
• vrijedi ≈ VRYEH-dee

A few useful pronunciation points:

• j in Croatian sounds like English y
• ije in vrijedi is pronounced roughly like ye
• Croatian spelling is generally very regular, so once you know the sounds, pronunciation becomes easier

It is fairly neutral and natural.

It would work in:

• customer service
• product documentation
• notices
• everyday conversation

Using jamstveni makes it sound a bit more standard or official than garancijski, but it is still perfectly normal.