Χωρίς τα απαραίτητα έντυπα, η αίτηση δεν γίνεται δεκτή.

Χωρίς is a preposition meaning without. It is followed by the accusative case in Modern Greek.

In this sentence, τα απαραίτητα έντυπα is the object of χωρίς, so it is in the accusative.
Because έντυπα is neuter plural, its accusative form looks the same as its nominative form, so you do not see a visible change.

These three words have to agree with each other:

• τα = the (neuter plural)
• απαραίτητα = necessary (neuter plural)
• έντυπα = forms / documents (neuter plural)

Greek adjectives agree with the noun they describe in:

• gender
• number
• case

So since έντυπα is neuter plural, both the article and the adjective are also neuter plural: τα απαραίτητα έντυπα.

Έντυπο literally means something like a printed form, form, or document.
In administrative or official language, έντυπα often refers to the required paperwork or forms you need to submit.

So in this sentence, τα απαραίτητα έντυπα means something like:

• the necessary forms
• the required documents
• the necessary paperwork

The exact English wording depends on context.

The phrase Χωρίς τα απαραίτητα έντυπα is placed at the beginning of the sentence to set the condition first: Without the necessary forms, ...

The comma helps separate this introductory phrase from the main clause:

• Χωρίς τα απαραίτητα έντυπα,
• η αίτηση δεν γίνεται δεκτή.

This is very similar to English punctuation with an introductory phrase.
You may sometimes see Greek commas used a little differently depending on style, but here the comma is very natural.

Αίτηση means application. It is a feminine singular noun, so it takes the feminine singular article η.

So:

• η αίτηση = the application

This also matters later in the sentence, because δεκτή must agree with αίτηση.

Literally, δεν γίνεται δεκτή is something like:

• is not becoming accepted
• is not received as acceptable

But in natural English, it simply means:

• is not accepted
• will not be accepted

This is a very common formal Greek expression in notices, instructions, and administrative language.

A useful way to understand it is:

• γίνεται = becomes / is made
• δεκτή = accepted (literally acceptable / received in this context)

Together, they function like is accepted.

Because δεκτή refers to η αίτηση.

Greek often uses a structure like:

• γίνεται + adjective

Here, δεκτή is an adjective meaning accepted / admissible, and it must agree with the noun it describes.

Since αίτηση is feminine singular, the adjective is also feminine singular:

• η αίτηση ... δεκτή

If the noun were neuter plural, for example, the form would be different.

Greek very often expresses ideas like is accepted with:

• γίνομαι + adjective/participle

So γίνεται δεκτή is a standard formal way to say is accepted.

You could also encounter similar expressions such as:

• γίνεται αποδεκτή = is accepted
• δεν γίνεται δεκτή = is not accepted

This is especially common in official announcements, rules, and office language.

Δεν is the standard negation word used before verbs in Modern Greek.

So:

• γίνεται δεκτή = is accepted
• δεν γίνεται δεκτή = is not accepted

As a rule, δεν comes directly before the finite verb.

Greek often uses the present tense to state general rules, instructions, or policies.

So η αίτηση δεν γίνεται δεκτή does not necessarily mean only right now. It means:

• the application is not accepted
• the application will not be accepted
• the application cannot be accepted

In official language, the present tense often has this timeless, rule-like meaning.

Yes. Greek word order is more flexible than English word order.

For example, you could also say:

• Η αίτηση δεν γίνεται δεκτή χωρίς τα απαραίτητα έντυπα.

This means the same thing. The difference is emphasis:

• Χωρίς τα απαραίτητα έντυπα, ... puts the condition first
• Η αίτηση δεν γίνεται δεκτή ... starts with the main topic, the application

The version you were given sounds very natural for a formal notice.

Yes, functionally it gives that idea.

Greek often uses a without + noun phrase structure where English might use a full clause:

• Without the necessary forms, the application is not accepted
• If the necessary forms are not included, the application is not accepted

So the Greek is more compact, but the meaning is essentially the same.

This sentence is useful because it shows several important Greek patterns at once:

1. Preposition + accusative

   • χωρίς τα απαραίτητα έντυπα

2. Article–adjective–noun agreement

   • τα απαραίτητα έντυπα

3. Negation with δεν

   • δεν γίνεται

4. Formal expression with γίνομαι + adjective

   • γίνεται δεκτή

5. Adjective agreeing with the subject noun

   • η αίτηση ... δεκτή

So even though the sentence is short, it is a very good example of common formal Greek structure.