Tugas ini mustahil.

In Indonesian, you usually do not need a verb like is/am/are when the predicate is a noun, adjective, or sometimes a phrase.

So:

• Tugas ini mustahil = This task is impossible

Literally, it is more like:

• task this impossible

This is completely normal in Indonesian.
If you want, you can sometimes use words like adalah in more formal contexts, but adalah is not normally used before adjectives here.

So:

• Tugas ini mustahil ✅ natural
• Tugas ini adalah mustahil ❌ unnatural

Tugas usually means:

• task
• assignment
• duty

The best translation depends on context.

For example:

• in school: assignment
• at work: task
• in a broader sense: duty

So Tugas ini mustahil could mean:

• This task is impossible
• This assignment is impossible

depending on the situation.

In Indonesian, demonstratives like ini (this) and itu (that) usually come after the noun.

So:

• tugas ini = this task
• rumah itu = that house
• buku ini = this book

This is one of the most important word-order differences from English.

English:

• this task

Indonesian:

• tugas ini

Yes. Mustahil is an adjective meaning impossible.

In this sentence, it functions as the predicate:

• Tugas ini = subject
• mustahil = predicate adjective

Indonesian adjectives can directly act as predicates without is.

Other examples:

• Mobil itu mahal = That car is expensive
• Soal ini sulit = This question is difficult
• Anak itu senang = That child is happy

Mustahil is a very normal word, but it can sound a bit stronger or sometimes a bit more formal/literary than some alternatives.

Another very common expression is:

• tidak mungkin = not possible / impossible

So you may hear both:

• Tugas ini mustahil
• Tugas ini tidak mungkin

Both are correct.
In everyday speech, tidak mungkin is often very common.
Mustahil can sound a bit more emphatic or absolute.

In casual speech, people may also say:

• nggak mungkin = not possible / no way

Not if you want to say exactly This task is impossible.

The natural sentence is:

• Tugas ini mustahil

If you say:

• Ini tugas mustahil

it sounds incomplete or unnatural for that meaning.

If you want to start with ini, a more natural structure would be:

• Ini tugas yang mustahil = This is an impossible task

So compare:

• Tugas ini mustahil = This task is impossible
• Ini tugas yang mustahil = This is an impossible task

These are close in meaning, but they are structured differently.

They are different structures.

• Tugas ini mustahil = This task is impossible

  • mustahil is the predicate

• tugas mustahil ini = this impossible task

  • here mustahil describes tugas inside the noun phrase

So:

1. Tugas ini mustahil.
   = The task is impossible.

2. Tugas mustahil ini sulit dijelaskan.
   = This impossible task is hard to explain.

This is a useful distinction:

• after the noun phrase as the main statement -> predicate
• inside the noun phrase -> description of the noun

To negate an adjective in Indonesian, use tidak.

So:

• Tugas ini tidak mustahil = This task is not impossible

That is grammatical, though in real life people might often prefer a more natural positive wording, such as:

• Tugas ini mungkin = This task is possible

or

• Tugas ini masih mungkin = This task is still possible

Yes.

• Tugas ini mustahil = This task is impossible
• Tugas itu mustahil = That task is impossible

Again, the demonstrative comes after the noun.

A simple pronunciation guide is:

• tugas -> TOO-gas
• ini -> ee-NEE
• mustahil -> moos-tah-HEEL

More roughly:

• TOO-gas ee-NEE moos-tah-HEEL

A few notes:

• u is usually like oo in food
• i is usually like ee in see
• a is usually like a in father
• h is pronounced

Indonesian stress is usually not as strong as in English, so try to keep it fairly even and smooth.

Tugas ini mustahil sounds neutral to fairly formal. It is perfectly normal Indonesian.

If you wanted something more casual in conversation, you might hear:

• Tugas ini nggak mungkin
• Tugas ini susah banget = This task is really hard
  (not exactly the same as impossible, but common in speech)

So mustahil is not strange, but in very casual everyday conversation, people may choose nggak mungkin more often.

Not necessarily. Like this in English, ini can refer to:

• something physically near you
• something currently being discussed
• something just mentioned
• something on a page or screen

So Tugas ini mustahil could mean:

• This task here is impossible
• This assignment we are talking about is impossible

It does not have to be physically near the speaker.

Yes, but be careful with what sounds natural.

You can say:

• Tugas ini sungguh mustahil = This task is truly impossible
• Tugas ini hampir mustahil = This task is almost impossible
• Tugas ini terasa mustahil = This task feels impossible

However, very impossible is not always natural in either English or Indonesian.
So while something like sangat mustahil may be understandable, speakers often prefer:

• benar-benar mustahil = truly impossible
• nyaris mustahil = nearly impossible
• hampir mustahil = almost impossible

Yes. Tugas ini mustahil is a complete and natural sentence.

It has:

• a subject: tugas ini
• a predicate: mustahil

Indonesian does not require an extra verb here, so the sentence is fully complete as it stands.