Walaupun saya bilang tunggu sebentar, dia tetap ngotot berangkat sekarang.

Walaupun means although / even though. It introduces a contrast:

• Walaupun saya bilang tunggu sebentar = Even though I said to wait a moment
• dia tetap ngotot berangkat sekarang = he/she still insisted on leaving now

So the structure is:

Walaupun + clause, main clause

It shows that the second part happened despite the first part.

Because bilang is very commonly used in everyday Indonesian to report speech in a simple, direct way.

In casual or neutral speech, Indonesians often say:

• Saya bilang tunggu sebentar. = I said, wait a moment.

You do not need bahwa here, because the speaker is reporting an instruction, almost like direct speech without quotation marks.

If you wanted a fuller or more explicit version, you could say:

• Saya bilang kepada dia untuk menunggu sebentar.
• Saya mengatakan bahwa dia harus menunggu sebentar.

But the original sentence is very natural and common in conversation.

Yes. Tunggu sebentar is an imperative, meaning wait a moment.

In Indonesian, commands often appear without a subject:

• Tunggu sebentar = Wait a moment
• Duduk = Sit down
• Lihat = Look

The subject you is understood from context.

So in saya bilang tunggu sebentar, the idea is: I told him/her, “Wait a moment.”

Sebentar means a moment, a little while, or briefly, depending on context.

In tunggu sebentar, it means:

• wait a moment
• wait a little bit

It is very common in everyday Indonesian.

Examples:

• Sebentar ya. = Just a moment, okay?
• Saya keluar sebentar. = I’m stepping out for a moment.

Tetap here means still, nevertheless, or all the same.

It emphasizes that the person continued with the action despite what was said before.

So:

• dia tetap ngotot = he/she still insisted
• dia tetap berangkat = he/she left anyway

In this sentence, tetap strengthens the contrast introduced by walaupun.

A natural English sense is: Even though I told him/her to wait a moment, he/she still insisted on leaving now.

Ngotot means something like:

• to insist stubbornly
• to be adamant
• to keep pushing one’s own will

It often has a nuance of stubbornness, so it is stronger than just wanting something.

For example:

• Dia ngotot mau ikut. = He/she stubbornly insisted on coming along.
• Dia tetap ngotot. = He/she kept insisting.

This is a fairly colloquial word. A more formal alternative is bersikeras.

So:

• dia tetap ngotot berangkat sekarang
  = he/she still stubbornly insisted on leaving now

Ngotot is informal or conversational. It is very common in speech and casual writing, but it is not especially formal.

A more formal version of the sentence would be:

• Walaupun saya mengatakan agar menunggu sebentar, dia tetap bersikeras berangkat sekarang.

Here:

• mengatakan is more formal than bilang
• bersikeras is more formal than ngotot

So the original sentence sounds natural and everyday, not stiff or textbook-like.

Berangkat and pergi can both relate to going/leaving, but they are not exactly the same.

Berangkat usually means:

• to depart
• to set off
• to leave for a destination

It often focuses on the start of a trip or journey.

Pergi is more general:

• to go
• to leave

So in this sentence, berangkat sekarang sounds like:

• leave right now
• set off now
• depart now

That fits well if the person is about to head somewhere and is insisting on starting immediately.

Yes, sekarang means now. In berangkat sekarang, it tells you the time of the departure:

• berangkat sekarang = leave now / depart now

Its position after the verb is very normal in Indonesian.

Compare:

• Dia datang sekarang. = He/she is coming now.
• Kami makan sekarang. = We’re eating now.

So nothing unusual is happening here.

Because Indonesian often leaves out information that is already clear from context.

In saya bilang tunggu sebentar, the speaker does not explicitly say to him/her or you, because it is understood.

If you wanted to make it explicit, you could say:

• Saya bilang kepadanya, tunggu sebentar.
• Saya bilang kepada dia untuk menunggu sebentar.

But in natural speech, omitting that is very common.

Yes. Walaupun and meskipun both mean although / even though and are often interchangeable.

So you could also say:

• Meskipun saya bilang tunggu sebentar, dia tetap ngotot berangkat sekarang.

A rough tendency is:

• meskipun can sound a little more formal or written
• walaupun is very common in everyday speech too

Both are correct here.

The comma separates the subordinate clause from the main clause:

• Walaupun saya bilang tunggu sebentar,
• dia tetap ngotot berangkat sekarang.

This is similar to English punctuation after an opening although clause.

In informal writing, punctuation in Indonesian can be somewhat flexible, but the comma here is normal and helpful.

A more formal version would be:

• Walaupun saya mengatakan agar dia menunggu sebentar, dia tetap bersikeras untuk berangkat sekarang.

Changes:

• bilang → mengatakan
• ngotot → bersikeras
• tunggu sebentar → dia menunggu sebentar or agar menunggu sebentar
• adding untuk before berangkat is also common in more formal phrasing

The original sentence is more conversational and natural for everyday use.