Uskraćeni ukrcaj je problem.

The subject is uskraćeni ukrcaj.

• ukrcaj = boarding
• uskraćeni = denied / withheld

Together, uskraćeni ukrcaj means denied boarding.

The verb je means is, so the structure is:

• Uskraćeni ukrcaj = subject
• je = verb
• problem = predicate noun / complement

So literally, the sentence is Denied boarding is a problem.

Because uskraćeni has to agree with ukrcaj.

In Croatian, adjectives match the noun in:

• gender
• number
• case

Here, ukrcaj is:

• masculine
• singular
• nominative

So the adjective also appears in the masculine singular nominative form:

• uskraćeni ukrcaj

This agreement is very important in Croatian.

It is in the nominative case.

Why?

Because it is the subject of the sentence, and subjects are normally in the nominative in Croatian.

You can recognize this from the basic dictionary-like form of the noun:

• ukrcaj = nominative singular

And the adjective agrees with it:

• uskraćeni = nominative singular masculine

Because after biti (to be), Croatian often uses the nominative for the predicate noun as well.

So in:

• Uskraćeni ukrcaj je problem.

both of these are nominative:

• uskraćeni ukrcaj = the subject
• problem = what the subject is identified as

This is similar to English X is Y.

Croatian does not have articles like English a, an, or the.

So:

• problem can mean a problem or the problem
• the exact meaning depends on context

In this sentence, English would most naturally say a problem, but Croatian simply says:

• je problem

with no article at all.

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

So:

• ja sam = I am
• ti si = you are
• on/ona/ono je = he/she/it is

In this sentence, je means is:

• Uskraćeni ukrcaj je problem.
• Denied boarding is a problem.

Not completely. Croatian word order is more flexible than English.

The neutral, straightforward order here is:

• Uskraćeni ukrcaj je problem.

But you could also say:

• Problem je uskraćeni ukrcaj.

That changes the emphasis a bit. It sounds more like:

• The problem is denied boarding
  or
• Denied boarding is the problem

So the original sentence is the most neutral version, but other orders are possible depending on emphasis.

It is basically a passive participle used like an adjective.

It comes from the verb:

• uskratiti = to deny, withhold

From that verb, Croatian forms a participle/adjectival form:

• uskraćen / uskraćeni = denied, withheld

In uskraćeni ukrcaj, it functions just like an adjective modifying ukrcaj.

This is very common in Croatian: forms that come from verbs often behave like adjectives.

Because here uskraćeni is being used as an adjective inside the noun phrase:

• uskraćeni ukrcaj = denied boarding

That is the normal way to express this idea as a single concept.

If you said something like:

• Ukrcaj je uskraćen.

that would mean something more like:

• Boarding has been denied.

So:

• uskraćeni ukrcaj = a noun phrase
• ukrcaj je uskraćen = a full clause

Those are related, but not the same structure.

Good question. Croatian masculine adjectives can have a short and a long form in some situations.

Here, uskraćeni is the long/definite form, which is very natural when the adjective stands before the noun:

• uskraćeni ukrcaj

You may also see a short form like uskraćen, especially in predicate position:

• Ukrcaj je uskraćen.

Very roughly:

• uskraćeni ukrcaj = denied boarding
• ukrcaj je uskraćen = boarding is denied / has been denied

For learners, the safest thing is to learn this whole phrase as:

• uskraćeni ukrcaj

Yes, ukrcaj is masculine.

One clue is that many Croatian masculine nouns in the nominative singular end in a consonant:

• problem
• ukrcaj

Also, the adjective shows masculine agreement:

• uskraćeni = masculine singular nominative

So the phrase itself helps confirm the gender.

Yes. It sounds like a general statement:

• Denied boarding is a problem.

Croatian often uses this simple present structure for general truths, definitions, or broad observations.

So this sentence is not about one specific event unless the context makes it specific. By itself, it sounds like a general claim.

Ukrcaj is a noun meaning boarding.

By contrast, ukrcati se is a verb meaning to board.

Compare:

• ukrcaj = boarding
• ukrcati se = to board

So in this sentence, Croatian uses a noun phrase:

• uskraćeni ukrcaj = denied boarding

This is similar to English, where boarding can also be a noun.

Most naturally, probably as:

• Denied boarding is a problem.

Depending on context, it could also be understood as:

• Denied boarding is an issue.
• Boarding denial is a problem.

But Denied boarding is a problem is the most direct and natural match.