Jendela kamar saya tertutup karena angin malam terlalu kencang.

In Indonesian, the main noun usually comes first, and anything that describes or specifies it comes after it.

So the structure is:

• jendela = window
• kamar = room
• saya = my

Together, jendela kamar saya literally follows the pattern:

• window + room + my

This means the window of my room.

A helpful way to think of it is that Indonesian often stacks nouns from the most general head noun first, then adds more detail after it.

Because in Indonesian, words like saya, kamu, and dia can function as possessors when they come after a noun.

For example:

• saya = I / me
• kamar saya = my room
• buku saya = my book

So in jendela kamar saya, saya is not acting as the subject I. It is showing possession: my room.

Tertutup comes from tutup and uses the prefix ter-.

In this sentence, tertutup describes a state: the window is closed / shut.

Very often, ter- can show that something is in a certain condition or that something happened without focusing on who did it.

So jendela kamar saya tertutup means the window is in a closed state.

It does not strongly mean someone closed it. It focuses more on the result or condition.

Indonesian often does not use a verb like is / am / are in simple descriptive sentences.

So where English says:

• The window is closed

Indonesian can simply say:

• Jendela ... tertutup

This is completely normal. The adjective or stative form can directly describe the noun without a separate copula.

Not exactly.

• tertutup = closed, in a closed state
• ditutup = closed by someone / something, more clearly passive

Compare:

• Pintunya tertutup. = The door is closed.
• Pintunya ditutup oleh ibu. = The door was closed by mother.

In your sentence, tertutup is a natural choice because the focus is on the window’s condition, not on an agent doing the action.

Often, yes, or at least it avoids saying who did it.

The prefix ter- can sometimes suggest:

• a resulting state
• something accidental
• something not explicitly caused by a named person

In this sentence, because it is followed by karena angin malam terlalu kencang, it sounds like the strong night wind caused the window to end up closed.

So the emphasis is on the result, not on a deliberate action.

Karena means because.

It introduces the reason:

• karena angin malam terlalu kencang = because the night wind was too strong

You can place this clause after the main clause, as in your sentence:

• Jendela kamar saya tertutup karena angin malam terlalu kencang.

Or before it:

• Karena angin malam terlalu kencang, jendela kamar saya tertutup.

Both are natural. The meaning stays basically the same.

Yes. In angin malam, malam is modifying angin.

• angin = wind
• malam = night

Together, angin malam means night wind or the wind at night.

This kind of noun + modifier combination is very common in Indonesian. Even though malam is usually a noun meaning night, it can still function as a modifier in a phrase like this.

Terlalu means too.

So:

• kencang = strong / fast / hard
• terlalu kencang = too strong

This adds the idea that the wind was more than normal or more than acceptable, which helps explain why the window ended up closed.

If you said only angin malam kencang, that would just mean the wind was strong.
With terlalu, it sounds like the strength of the wind caused a problem or effect.

This is an important difference:

• sangat kencang = very strong
• terlalu kencang = too strong

So:

• sangat is just strong emphasis
• terlalu suggests excess

In your sentence, terlalu kencang fits better because the strong wind is presented as the reason something happened.

Kencang is a very common word for describing wind, speed, or tightness depending on context.

For wind, kencang means something like:

• strong
• forceful

So angin kencang is the standard way to say strong wind.

A learner might wonder about kuat, but angin kencang is much more natural than angin kuat in everyday Indonesian.

Not necessarily.

It most directly means the window of my room or my room’s window.

If the context is that kamar means bedroom, then yes, English might naturally translate it as my bedroom window. But grammatically, the Indonesian phrase itself is simply:

• window + room + my

So it is about the window belonging to my room, not necessarily a special single-word idea like English sometimes prefers.

No. Indonesian does not normally use articles equivalent to English the or a/an.

So jendela kamar saya can be understood from context without an article. English has to choose something like the window of my room or my room’s window, but Indonesian does not mark that in the same way.

Context usually makes it clear whether something is definite or indefinite.

Yes. For example, you could say:

• Angin malam yang terlalu kencang menutup jendela kamar saya.

This makes the wind the grammatical subject that actively closes the window.

But your original sentence:

• Jendela kamar saya tertutup karena angin malam terlalu kencang.

sounds more natural if you want to describe the window’s state and then give the reason.

So the original is often smoother and more idiomatic.

In normal usage, it means because the night wind was too strong.

That is because:

• angin malam is the noun phrase
• terlalu kencang describes its strength

So the focus is on how strong the wind was, not on the amount of wind in a countable sense.

Yes, it is natural and clear.

It has a very typical Indonesian structure:

• noun phrase: jendela kamar saya
• predicate/state: tertutup
• reason clause: karena angin malam terlalu kencang

A native speaker would understand it easily, and it sounds normal in everyday usage.