Kos pemulangan terlalu tinggi.

Pemulangan comes from the root pulang, which means to return / go back home.

The pattern is:

• pulang = return, go back
• peN-...-an → a noun-forming pattern
• pemulangan = returning, the return, or the process/case of returning

This pattern often turns a verb or root into a noun referring to an action, process, or result.

Malay often does not use a verb like is / are in simple present statements.

So:

• Kos pemulangan terlalu tinggi
• literally: Return cost too high
• natural English: The return cost is too high

This is completely normal in Malay. The adjective tinggi can act as the predicate without needing a separate word for is.

Terlalu usually means too in the sense of more than is acceptable, desirable, or reasonable.

So:

• terlalu tinggi = too high
• sangat tinggi = very high

That is an important difference:

• Kos pemulangan sangat tinggi = The return cost is very high.
• Kos pemulangan terlalu tinggi = The return cost is too high.
  This suggests a problem or complaint.

Both can relate to high prices, but they are used a bit differently.

• mahal = expensive
• tinggi = high

With costs, rates, fees, or prices, Malay very often uses tinggi:

• harga tinggi = high price
• kos tinggi = high cost
• caj yang tinggi = high charge

So Kos pemulangan terlalu tinggi is very natural.

You may also hear mahal, but tinggi fits especially well with things like cost, price, rate, and fee.

In Malay, the main noun usually comes first, and the word after it explains or narrows its meaning.

So:

• kos = cost
• pemulangan = return / returning

Therefore:

• kos pemulangan = cost of return / return cost

This is similar to how Malay builds many noun phrases:

• harga minyak = oil price
• bil elektrik = electricity bill
• tiket kapal terbang = airplane ticket

The first noun is the main thing, and the following word tells you what kind of thing it is.

It can be understood as either cost or costs, depending on context.

Malay often does not mark plural unless it needs to. So kos can refer to:

• one return cost
• return costs in general

If the context is about returning one item, English may translate it as The return cost is too high.
If the context is more general, it could be Return costs are too high.

Malay does not have articles like a, an, and the in the same way English does.

So Kos pemulangan terlalu tinggi could mean:

• The return cost is too high
• Return costs are too high
• A return cost is too high
  though that last one is less likely in normal context

Specificity usually comes from context. If needed, Malay can add words like:

• ini = this
• itu = that

For example:

• Kos pemulangan ini terlalu tinggi = This return cost is too high.

Not always. Pemulangan can refer more generally to returning something or someone. Depending on context, it could mean:

• return of goods
• return shipment
• return of documents
• repatriation / sending someone back

But in a sentence with kos and in everyday consumer situations, learners will most often understand it as the cost of returning an item.

Yes, that is possible, but it is a little less compact.

• Kos pemulangan terlalu tinggi = concise and natural
• Kos untuk pemulangan terlalu tinggi = also understandable, with a slightly more explicit for

In many cases, Malay prefers the shorter noun+noun structure when it sounds natural.

Yes, and that version is also natural.

Compare:

• Kos pemulangan terlalu tinggi = The return cost is too high.
  More compact, slightly more formal or label-like.
• Kos memulangkan barang terlalu tinggi = The cost of returning the item is too high.
  More explicit and verbal.

The second version is useful if you want to clearly mention the action of returning an item.

A simple pronunciation guide:

• Kos → kohs
• pemulangan → puh-moo-lah-ngan
• terlalu → ter-lah-loo
• tinggi → ting-ghee

A more careful breakdown:

• pe-mu-la-ngan
• ter-la-lu
• ting-gi

The ng in pemulangan and tinggi is like the sound in English sing.

The structure is:

• Kos pemulangan = subject / noun phrase
• terlalu tinggi = predicate / description

So the pattern is basically:

• [noun phrase] + [adverb + adjective]

In other words:

• The return cost
  • too high

This is a very common Malay sentence pattern.

It sounds neutral and fairly natural. It would fit well in:

• customer service
• e-commerce
• business writing
• complaints
• general conversation

Because kos and pemulangan are a bit concise, it can also sound slightly more written or administrative than a very casual spoken sentence. In casual speech, someone might also say something like:

• Kos nak pulangkan barang terlalu tinggi
• Caj pemulangan terlalu tinggi

But your original sentence is perfectly good Malay.