A másik lakás bútorozatlan.

Word by word:

• a = the
• másik = other, the other, or sometimes another depending on context
• lakás = apartment / flat
• bútorozatlan = unfurnished

So the sentence means The other apartment is unfurnished.

Here a is the definite article, so it means the.

Hungarian has two forms of the definite article:

• a before a consonant sound
• az before a vowel sound

Since másik starts with m, Hungarian uses a másik.

Compare:

• a lakás = the apartment
• az autó = the car

If you wanted an/another apartment, you would normally use egy:

• egy másik lakás = another apartment

This is a very common confusion.

• másik = other / another
• második = second

So:

• A másik lakás = The other apartment
• A második lakás = The second apartment

They look similar, but they mean different things.

Lakás usually means apartment or flat. It refers to a dwelling unit, especially in a building.

It does not usually mean house. For house, Hungarian normally uses ház.

So:

• lakás = apartment / flat
• ház = house

Depending on context, lakás can sometimes be translated more generally as home or residence, but apartment/flat is the safest basic meaning.

In Hungarian, the verb to be is often omitted in the present tense, third person, when the predicate is a noun or an adjective.

So Hungarian says:

• A másik lakás bútorozatlan.

But in English you must say:

• The other apartment is unfurnished.

This omission happens very often:

• A szoba nagy. = The room is big.
• A lakás drága. = The apartment is expensive.

But in other tenses, the verb appears:

• A másik lakás bútorozatlan volt. = The other apartment was unfurnished.

Because they are doing different jobs.

• másik directly modifies the noun lakás, so it comes before the noun.
• bútorozatlan is the predicate adjective: it tells you what the apartment is like, so it comes in the predicate position, after the subject.

So:

• a másik lakás = the other apartment
  Here másik is part of the noun phrase.

• A másik lakás bútorozatlan. = The other apartment is unfurnished.
  Here bútorozatlan is what is being said about the apartment.

If you put bútorozatlan before the noun, it becomes part of the noun phrase:

• a bútorozatlan lakás = the unfurnished apartment

It is built from smaller parts:

• bútor = furniture
• bútoroz = to furnish
• bútorozatlan = unfurnished

The ending -tlan / -atlan / -etlen often gives a meaning like without or un- / -less, depending on the word.

So bútorozatlan literally has the sense of not furnished.

A useful related word is:

• bútorozott = furnished

So:

• bútorozott lakás = furnished apartment
• bútorozatlan lakás = unfurnished apartment

Hungarian does not have grammatical gender like English he/she/it distinctions in nouns, so there is no gender agreement here.

With number, Hungarian works differently from many European languages:

• Attributive adjectives (before a noun) usually do not take a plural ending:

  • bútorozatlan lakások = unfurnished apartments

• Predicate adjectives (like here) do take a plural ending if the subject is plural:

  • A lakás bútorozatlan. = The apartment is unfurnished.
  • A lakások bútorozatlanok. = The apartments are unfurnished.

So in your sentence, lakás is singular, so bútorozatlan stays singular too.

Yes, Hungarian word order is flexible, but changing it usually changes the focus or emphasis.

The neutral version is:

• A másik lakás bútorozatlan.

If you say:

• Bútorozatlan a másik lakás.

that still means The other apartment is unfurnished, but now bútorozatlan is emphasized more strongly, as if contrasting it with something else.

So the original sentence is the most neutral, straightforward version.

A rough pronunciation guide is:

• A ≈ short aw
• másik ≈ maa-shik
• lakás ≈ law-kaash
• bútorozatlan ≈ boo-to-ro-zot-lon

A few useful pronunciation notes:

• á is a long vowel
• ú is a long vowel
• s in Hungarian sounds like English sh
• sz in Hungarian sounds like English s

So:

• másik has sh, not s
• lakás ends with the same sh sound

By itself, másik can sometimes be translated as other or another, depending on context. But here the definite article a strongly points to the other apartment.

Compare:

• A másik lakás bútorozatlan. = The other apartment is unfurnished.
• Egy másik lakás bútorozatlan. = Another apartment is unfurnished.

So the article helps determine the most natural English translation.