Η εκπρόθεσμη πληρωμή δεν τεκμηριώνει την ένσταση.

Because the two nouns are in different cases.

• η εκπρόθεσμη πληρωμή is the subject of the sentence, so it is in the nominative.
• την ένσταση is the direct object, so it is in the accusative.

For feminine singular nouns with the definite article:

• η = nominative singular
• την = accusative singular

So Greek marks grammatical role more clearly than English does.

Because it has to agree with πληρωμή.

In Greek, adjectives agree with the noun they describe in:

• gender
• number
• case

Here:

• πληρωμή is feminine
• singular
• nominative

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

• masculine: εκπρόθεσμος
• feminine: εκπρόθεσμη
• neuter: εκπρόθεσμο

That is why you get η εκπρόθεσμη πληρωμή.

It means something like late, past the deadline, or not submitted/made on time.

This word is especially common in formal or administrative language. It is more precise and official-sounding than a casual everyday word for late.

So εκπρόθεσμη πληρωμή is not just a payment that happened late in a vague sense; it suggests a payment made after the official deadline.

τεκμηριώνει is:

• 3rd person singular
• present tense
• active voice
• from the verb τεκμηριώνω

So it means he/she/it substantiates, documents, supports with evidence, or justifies.

In this sentence, the subject is η εκπρόθεσμη πληρωμή, which is singular, so the verb is also singular:

• η πληρωμή τεκμηριώνει

Because δεν is the normal negation for the indicative, meaning ordinary statements of fact.

This sentence is a straightforward statement:

• Η εκπρόθεσμη πληρωμή δεν τεκμηριώνει την ένσταση.

Greek usually uses:

• δεν with indicative verb forms
• μη(ν) with subjunctive forms, commands, or certain set expressions

So here δεν is exactly what you would expect.

• πληρωμή is nominative singular
• ένσταση is accusative singular

You can tell mostly from their function and their articles:

• η πληρωμή = subject → nominative
• την ένσταση = direct object → accusative

An important point for learners: many feminine nouns in -η or -ση can look the same in nominative and accusative singular, so the article often tells you the case more clearly than the noun ending does.

Here:

• η shows nominative
• την shows accusative

No, Greek word order is more flexible than English word order.

This sentence uses a very neutral, standard order:

• subject + δεν + verb + object

So:

• Η εκπρόθεσμη πληρωμή δεν τεκμηριώνει την ένσταση.

That is the most natural choice in many contexts.

But Greek could rearrange parts of the sentence for emphasis, for example putting την ένσταση earlier if the speaker wants to highlight it. The case endings and articles help keep the meaning clear even when the order changes.

Not always. ένσταση is a formal word and can mean different things depending on context, such as:

• objection
• appeal
• challenge
• formal protest

In legal, administrative, or bureaucratic Greek, the best English translation depends on the exact situation.

So in this sentence, την ένσταση could be the objection, but in another context it might be better translated as the appeal.

Yes, very much so.

Several words make it sound formal or administrative:

• εκπρόθεσμη
• τεκμηριώνει
• ένσταση

This is not the kind of sentence you would usually hear in casual everyday conversation. It sounds more like something from:

• legal language
• a written decision
• official correspondence
• administrative procedures

A learner should recognize that this is standard Greek, but in a noticeably formal register.