Takdir tidak dapat diubah.

Takdir means fate, destiny, or what has been determined. It is a fairly formal word and is often used in philosophical or religious contexts.

In Takdir tidak dapat diubah, it refers to destiny/fate in a general sense.

In Indonesian, tidak is used to negate:

• verbs
• adjectives
• adverbs

Bukan is usually used to negate:

• nouns
• noun phrases
• identity/classification

Here, dapat diubah is a verbal idea: can be changed. So the correct negation is tidak.

• Takdir tidak dapat diubah = Destiny cannot be changed
• not Takdir bukan dapat diubah

Dapat means can, be able to, or may. In this sentence, it shows possibility or ability.

So:

• dapat diubah = can be changed
• tidak dapat diubah = cannot be changed

Dapat is a bit more formal than bisa, though both often mean can.

Yes. Takdir tidak bisa diubah is natural and common.

The difference is mainly tone:

• tidak dapat diubah = more formal, written, or serious
• tidak bisa diubah = more everyday and conversational

Both mean essentially the same thing here.

Diubah is the passive form of the verb ubah, which means to change.

It is formed with the prefix di- + root ubah:

• ubah = change
• diubah = changed / be changed

So dapat diubah literally means can be changed.

No. They are different.

• di- as a prefix is attached to a verb and marks the passive:
  • diubah = changed / be changed
• di as a preposition is written separately:
  • di rumah = at home
  • di Jakarta = in Jakarta

So:

• diubah = one word, because it is a verb
• di rumah = two words, because di is a preposition

Yes. Takdir tidak dapat diubah is a passive construction.

The focus is on takdir as the thing affected by the action, not on who changes it.

Compare:

• Active: Seseorang tidak dapat mengubah takdir.
  = Someone cannot change destiny.
• Passive: Takdir tidak dapat diubah.
  = Destiny cannot be changed.

The passive is very natural in Indonesian, especially when the doer is unknown, unimportant, or general.

The structure is:

• Takdir = subject/topic
• tidak = negation
• dapat = can
• diubah = be changed

So the pattern is basically:

subject + negation + modal + passive verb

This is a normal Indonesian word order.

You can think of it as:

• Takdir = destiny
• tidak dapat = cannot
• diubah = be changed

You can, but the meaning changes.

• Takdir tidak dapat diubah = Destiny cannot be changed
• Takdir tidak diubah = Destiny is not changed or Destiny was not changed

Without dapat, you remove the idea of ability/possibility. So if you want cannot be changed, keep dapat or bisa.

A simple pronunciation guide is:

• takdir → tahk-deer
• tidak → tee-dahk
• dapat → dah-paht
• diubah → dee-oo-bah

A few helpful notes:

• r in Indonesian is usually rolled or tapped.
• Final k in tidak is often unreleased or softened in casual speech.
• diubah has three clear vowel parts: di-u-bah.

It is common enough to be understood by everyone, but it sounds more serious or abstract than basic daily vocabulary.

You are more likely to see takdir in:

• literature
• religious discussion
• philosophical statements
• emotional or dramatic language

In very casual conversation, people may still use it, but not as often as more ordinary words.

The active form is mengubah.

• mengubah = to change
• diubah = to be changed

Examples:

• Dia mengubah rencana.
  = He/She changed the plan.
• Rencana itu diubah.
  = The plan was changed.

A useful note: standard Indonesian uses mengubah, not merubah.

It sounds natural, but somewhat formal or weighty because of the vocabulary and idea.

• Takdir gives it a serious tone.
• tidak dapat also sounds more formal than tidak bisa.

So the sentence would fit well in:

• a book
• a proverb-like statement
• a speech
• a reflective conversation

It is grammatically simple, but stylistically a bit elevated.