Ο λογαριασμός είναι ανεξόφλητος.

• Ο = the (masculine singular definite article, nominative case)
• λογαριασμός = bill / account
• είναι = is
• ανεξόφλητος = unpaid / unsettled / outstanding

So the structure is:

article + noun + verb + adjective

More literally: The bill/account is unpaid.

Ο is the masculine singular form of the in the nominative case.

Greek uses articles very regularly, often more regularly than English. Since λογαριασμός is:

• masculine
• singular
• the subject of the sentence

the correct article is ο.

Compare:

• ο λογαριασμός = the bill/account
• ένας λογαριασμός = a bill/account

Because it is an adjective agreeing with λογαριασμός.

In Greek, adjectives change form to match the noun they describe in:

• gender
• number
• case

Since λογαριασμός is masculine singular nominative, the adjective also appears in the masculine singular nominative form:

• masculine: ανεξόφλητος
• feminine: ανεξόφλητη
• neuter: ανεξόφλητο

Examples:

• Ο λογαριασμός είναι ανεξόφλητος.
• Η οφειλή είναι ανεξόφλητη.
• Το ποσό είναι ανεξόφλητο.

It is in the nominative singular.

That is because λογαριασμός is the subject of the sentence: it is the thing that is unpaid.

You can recognize this from:

• the article ο
• the noun ending -ος
• the fact that it comes before είναι as the subject

Not always. Είναι is a form of είμαι (to be), and it can mean:

• he/she/it is
• you are (formal singular)
• they are

In this sentence, it means is, because the subject is singular:

Ο λογαριασμός είναι ανεξόφλητος. = The bill is unpaid.

So the exact English translation depends on the subject.

A rough pronunciation guide:

Ο λογαριασμός είναι ανεξόφλητος
o lo-ga-ria-SMOS EE-ne a-ne-kso-FLEE-tos

A few points:

• γ before α sounds like a soft g
• αι in είναι sounds like e
• ξ sounds like ks
• The stressed syllables are:
  • λογαριασμός
  • είναι
  • ανεξόφλητος

Greek stress matters, so try to keep the emphasis in the right place.

It can mean both, depending on context.

Common meanings of λογαριασμός include:

• bill (restaurant bill, utility bill)
• account (bank account, user account)
• sometimes calculation or reckoning in other contexts

In Ο λογαριασμός είναι ανεξόφλητος, the most natural meaning is usually:

• The bill is unpaid or
• The account is outstanding / unsettled

The context tells you which English word fits best.

Ανεξόφλητος means unpaid, not settled, or outstanding.

It comes from the idea of not having been paid off. It is commonly used for:

• bills
• debts
• balances
• invoices
• amounts due

So it is a bit more formal or financial than just saying something is not paid.

It is useful to see the parts:

• εξοφλώ = to pay off / settle
• εξόφλητος = paid off / settled (in form/derivation)
• ανεξόφλητος = unpaid / unsettled

The prefix αν- gives a negative meaning, similar to un- in English.

So you can think of:

• εξοφλώ = settle/pay off
• ανεξόφλητος = unsettled/unpaid

This kind of word-building is very common in Greek.

Yes. Greek word order is more flexible than English.

The neutral, straightforward order is:

Ο λογαριασμός είναι ανεξόφλητος.

But you may also hear:

• Ανεξόφλητος είναι ο λογαριασμός.
• Είναι ανεξόφλητος ο λογαριασμός.

These alternatives can sound more emphatic or stylistically marked. For a learner, the original order is the safest and most natural to produce.

Normally, no—not in standard neutral Greek for this meaning.

Greek usually wants the definite article with a specific subject noun:

• Ο λογαριασμός είναι ανεξόφλητος.

Without the article, it sounds unnatural here unless you are using a special style, headline language, or a very unusual context.

So for normal speech and writing, keep ο.

Yes. A common simpler alternative is:

Ο λογαριασμός δεν έχει πληρωθεί.
= The bill has not been paid.

Another adjective you may hear is:

Ο λογαριασμός είναι απλήρωτος.
= The bill is unpaid.

Compared with απλήρωτος, ανεξόφλητος can sound a bit more formal or financial, especially in billing, debt, or accounting contexts.

Greek accents show you where the stress falls in a word.

In this sentence:

• λογαριασμός → stress on the last syllable
• είναι → stress on the first syllable
• ανεξόφλητος → stress on -ξό-

Stress is important in Greek pronunciation and is always written in normal spelling. When learning vocabulary, it is best to memorize the stress together with the word.

Yes. The adjective must agree with the noun.

For example:

• Ο λογαριασμός είναι ανεξόφλητος.
  masculine singular
• Η απόδειξη είναι ανεξόφλητη.
  feminine singular
• Το τιμολόγιο είναι ανεξόφλητο.
  neuter singular

This agreement is one of the most important grammar patterns in Greek.