Penyakit itu serius.

In Malay, you often do not need a verb like is/are between a noun and an adjective.

So:

• Penyakit itu serius
• literally: disease that serious
• natural English: The disease is serious / That disease is serious

This is very normal in Malay. The adjective serius can come directly after the noun phrase without a separate copula like is.

Itu literally often means that, but in many sentences it can also function a bit like the, depending on context.

So penyakit itu can mean:

• that disease
• the disease

Which one sounds best depends on the situation.

In everyday Malay, noun + itu is a very common way to refer to something specific that both speaker and listener know about.

Malay usually puts adjectives after the noun they describe.

So:

• penyakit serius = a serious disease
• penyakit itu serius = the/that disease is serious

This is different from English, where adjectives usually come before the noun.

So for learners, a useful pattern is:

• noun + adjective
• rumah besar = big house
• masalah besar = big problem
• penyakit serius = serious disease

Not exactly.

• sakit usually means sick, ill, in pain, or hurt
• penyakit means disease or illness

They are related, but they are used differently.

Examples:

• Saya sakit. = I am sick.
• Dia sakit kepala. = He/She has a headache.
• Penyakit itu serius. = The disease is serious.

So penyakit is the noun for a medical condition, while sakit is more general.

Yes, but the meaning changes.

• Penyakit itu serius. = The/That disease is serious.
• Penyakit serius. = A serious disease / serious disease

Without itu, it may sound less complete as a full statement unless the context makes it clear. Often penyakit serius is just a noun phrase, not a full sentence.

If you want a clear full sentence meaning The disease is serious, keeping itu is very natural.

No. Malay adjectives do not change the way many English or European language words do.

Serius stays serius regardless of:

• singular or plural
• masculine or feminine
• present or past

So:

• penyakit itu serius = the disease is serious
• penyakit-penyakit itu serius = those diseases are serious

The adjective itself does not change.

Serius is a borrowed word, ultimately related to English serious, but it is fully normal in Malay.

Many modern Malay words come from other languages, and learners will notice that some look familiar. Even so, you should still learn their Malay pronunciation and usage rather than assuming they work exactly like English.

A simple learner-friendly pronunciation guide is:

• penyakit ≈ puh-NYAH-kit
• itu ≈ EE-too
• serius ≈ seh-REE-yoos

A few tips:

• ny in penyakit sounds like the ny in canyon
• Malay pronunciation is usually quite regular
• the r in serius is typically trilled or tapped lightly, depending on accent

You do not need perfect accent right away; being clear and consistent matters most.

You would usually say:

Penyakit itu tidak serius.

Here, tidak is used to negate adjectives and verbs.

So:

• serius = serious
• tidak serius = not serious

This is the normal pattern:

• tidak + adjective/verb

A common way is:

Adakah penyakit itu serius?

This is a standard yes-no question pattern in Malay.

In casual speech, people may also rely on intonation:

Penyakit itu serius?

That is more conversational, while Adakah penyakit itu serius? is more explicit and often taught to learners first.

Yes, it can.

Malay does not always mark definiteness in exactly the same way English does. Itu often points to something specific, and in translation that may become either:

• that disease
• the disease

You figure it out from context.

For example:

• if the speaker is contrasting one disease with another, that disease may fit better
• if both people already know which disease they mean, English may prefer the disease

So the Malay sentence itself is natural and flexible; English translation depends on context.

Yes. That means The/That disease is very serious.

Here:

• sangat = very

So you can build on the sentence easily:

• Penyakit itu serius. = The disease is serious.
• Penyakit itu sangat serius. = The disease is very serious.
• Penyakit itu terlalu serius. = The disease is too serious.

This is a very useful pattern with Malay adjectives.