Închisoarea este închisă.

Because they are related words.

• închisoare = prison
• închis(ă) = closed

Both come from the same Romanian root connected with the idea of closing / shutting:

• verb: a închide = to close

So this sentence has a kind of built-in word family:

• Închisoarea = the prison
• este închisă = is closed

That is why it looks a bit repetitive to an English speaker, but it is completely normal Romanian.

Închisoarea means the prison.

It is made of:

• închisoare = prison
• -a = the definite article, meaning the

Romanian usually puts the at the end of the noun instead of before it.

So:

• închisoare = a prison / prison
• închisoarea = the prison

That is a normal feature of Romanian grammar. Romanian has a postposed definite article, which means the article is attached to the noun.

Compare:

• băiat = boy

• băiatul = the boy

• casă = house

• casa = the house

• închisoare = prison
• închisoarea = the prison

So instead of a separate word like English the, Romanian usually adds the article directly to the noun.

Because închisoarea is a feminine singular noun, and the adjective has to agree with it.

Romanian adjectives change form to match the noun’s:

• gender
• number
• sometimes definiteness in other contexts

Here:

• închisoarea = feminine singular
• so the adjective is închisă = feminine singular form of closed

Compare:

• magazinul este închis = the shop is closed
  (magazinul is masculine singular)
• ușa este închisă = the door is closed
  (ușa is feminine singular)

It is basically the past participle of a închide used like an adjective.

• a închide = to close
• închis / închisă / închiși / închise = closed

In Închisoarea este închisă, it works as a predicate adjective after este:

• este închisă = is closed

English does something similar:

• The door is closed
• closed comes from the verb to close, but it behaves like an adjective there

Este means is.

It is the 3rd person singular form of a fi = to be.

So:

• Închisoarea este închisă = The prison is closed

In everyday Romanian, people often shorten este to e:

• Închisoarea e închisă

That is very common and natural.

Usually you do not leave it out completely in a normal sentence like this.

In this sentence, the natural meaning is the prison is closed / shut.

For a building or institution, închis(ă) usually means:

• not open
• shut
• unavailable to enter or use

Because prison already has an idea of confinement, English speakers may wonder if there is some special play on words. There is a little word-family overlap, but the sentence still straightforwardly means that the prison is closed.

Depending on context, it could mean:

• the prison is not open to visitors
• the prison has been shut down temporarily
• the prison is closed as an institution

Yes, depending on context, închis(ă) can sometimes be understood as closed, shut, or even locked.

For example:

• Ușa este închisă can mean The door is closed
• If context suggests it, it may also imply The door is shut/locked

But with Închisoarea este închisă, the default reading is simply The prison is closed.

If Romanian specifically wants to emphasize locked, it can use:

• încuiată = locked

So:

• Ușa este încuiată = The door is locked

Because Romanian nouns have grammatical gender, and închisoare belongs to the feminine class.

For English speakers, this can feel arbitrary, because English nouns usually do not have grammatical gender. In Romanian, though, every noun belongs to a gender category:

• masculine
• feminine
• neuter

You generally learn the noun together with its gender.

A useful clue:

• many nouns ending in -e or -are are feminine, though not always

So you should simply learn:

• o închisoare = a prison
• închisoarea = the prison

The article and adjective agreement then follow from that.

A rough pronunciation guide for an English speaker is:

în-ki-so-AH-re-a ES-te în-KEE-suh

A few important sounds:

• î = a central vowel that English does not really have; it is similar to the vowel in the second syllable of roses for some speakers, but tenser
• ch before i sounds like k
  • so închisoare starts with something like în-ki-
• ș sounds like English sh
• ă is a short neutral vowel, like a quick uh

So:

• închisă sounds roughly like în-KEE-suh

The normal, neutral word order is:

• Închisoarea este închisă.

That is the most straightforward way to say it.

Romanian does allow some flexibility in word order for emphasis, but not all rearrangements sound equally natural. For example:

• Închisă este închisoarea is possible only in a marked, literary, or contrastive style

For everyday use, stick with:

• Subject + este + adjective

It is grammatically correct and understandable, but it can sound a little striking because of the repeated închis- root.

That said, Romanian speakers would still understand it immediately. Whether it feels stylistically plain or slightly funny depends on context.

In real life, someone might also say something more specific, such as:

• Penitenciarul este închis. = The penitentiary is closed.
• Închisoarea nu este deschisă publicului. = The prison is not open to the public.

But Închisoarea este închisă is still a valid sentence.

Both can refer to a prison, but they are not always used in exactly the same way.

• închisoare is the common, general word for prison
• penitenciar is a more formal or institutional term, similar to penitentiary

So:

• închisoare is the everyday word you should learn first
• penitenciar may appear in official or formal contexts

You would use the indefinite article:

• O închisoare este închisă.

That literally means A prison is closed.

However, depending on context, Romanian might prefer other ways of phrasing it, because a prison is closed is a bit unusual by itself unless you are talking about one prison among others.

The key contrast is:

• închisoare = prison
• o închisoare = a prison
• închisoarea = the prison

You put nu before the verb:

• Închisoarea nu este închisă. = The prison is not closed.

In everyday speech:

• Închisoarea nu e închisă.

That is the normal way to make a sentence negative in Romanian.

Yes. With people, închis can have different meanings depending on context.

It can mean:

• locked in
• imprisoned
• sometimes reserved / closed-off in personality, though that is a different usage

For example:

• El este închis în cameră. = He is shut/locked in the room.
• A fost închis la închisoare. = He was imprisoned / locked up in prison.

So the same root appears in many related meanings: close, shut, lock up, imprison.