Keputusan rasmi itu diumumkan hari ini.

A word-by-word breakdown is:

• keputusan = decision, result, outcome
• rasmi = official
• itu = that, the
• diumumkan = was announced / is announced
• hari ini = today

So the whole sentence means something like The official decision was announced today.

In Malay, adjectives usually come after the noun they describe.

So:

• keputusan rasmi = official decision
• literally: decision official

This is normal Malay word order. English usually puts adjectives before the noun, but Malay usually puts them after.

In Malay, demonstratives like ini and itu usually come after the noun phrase.

So:

• keputusan rasmi itu = that official decision / the official decision
• literally: decision official that

This is very natural in Malay. English learners often expect itu to come before the noun, but it normally does not.

The prefix di- usually marks the passive voice in standard Malay.

So:

• mengumumkan = to announce
• diumumkan = to be announced / was announced

That means the sentence focuses on the official decision, not on the person or organization that announced it.

So Keputusan rasmi itu diumumkan hari ini is passive, similar to The official decision was announced today in English.

The ending -kan is a very common Malay suffix. In many verbs, it helps form a transitive meaning, often something like to do something to/with something.

Here:

• base idea: umum = public, general
• mengumumkan = to announce, to make something public
• diumumkan = to be announced

You do not need to translate -kan by itself every time, but it is part of the normal verb form here.

Because Malay often uses the passive when the doer is:

• unknown,
• obvious from context,
• unimportant, or
• deliberately not mentioned.

So Keputusan rasmi itu diumumkan hari ini means the decision was announced, but it does not say by whom.

If you wanted to include the agent, you could say something like:

• Keputusan rasmi itu diumumkan oleh kerajaan hari ini.
• The official decision was announced by the government today.

Here oleh means by.

Yes, diumumkan is one word.

This is important because Malay has:

• di- as a passive prefix
• di as a preposition meaning at/in/on

Compare:

• diumumkan = was announced
  
  • here di- is attached to the verb
• di sekolah = at school
  
  • here di is separate because it is a preposition

A useful rule:

• if it is the passive verb prefix, it is usually attached
• if it means location, it is usually separate

Yes. Malay word order is somewhat flexible, especially for time expressions.

These are both natural:

• Keputusan rasmi itu diumumkan hari ini.
• Hari ini, keputusan rasmi itu diumumkan.

Both mean basically the same thing. The version with hari ini first puts more emphasis on today.

Yes, it sounds fairly formal and natural, especially in news, official statements, or written Malay.

A few things make it sound formal:

• keputusan rasmi = official decision
• passive diumumkan
• overall concise structure

This is exactly the kind of sentence you might see in a newspaper or hear in a news broadcast.

An active version would need a subject that does the announcing. For example:

• Kerajaan mengumumkan keputusan rasmi itu hari ini.
• The government announced the official decision today.

Compare the two:

• Keputusan rasmi itu diumumkan hari ini.
  Focus on the decision.
• Kerajaan mengumumkan keputusan rasmi itu hari ini.
  Focus on the government as the doer.

Both are correct, but they highlight different things.

Yes. Keputusan is a broad word and can mean:

• decision
• result
• outcome

The exact meaning depends on context.

For example:

• keputusan mesyuarat = the decision of the meeting
• keputusan peperiksaan = exam results

In Keputusan rasmi itu diumumkan hari ini, the context could suggest either official decision or official result, depending on the situation.

A simple approximate pronunciation is:

• Keputusan → keh-poo-TOO-sahn
• rasmi → RAHS-mee
• itu → EE-too
• diumumkan → dee-oo-MOOM-kahn
• hari ini → HAH-ree EE-nee

So the full sentence is roughly:

keh-poo-TOO-sahn RAHS-mee EE-too dee-oo-MOOM-kahn HAH-ree EE-nee

This is only an approximation for English speakers, but it is a useful starting point.