Adik perempuan saya kesejukan selepas kehujanan di luar rumah.

Adik perempuan means younger sister.

• adik = younger sibling / younger brother or sister
• perempuan = female, woman

So adik perempuan specifies that the younger sibling is female.

In everyday Malay, people often just say adik if the gender is already clear from context. But adik perempuan is more explicit.

In Malay, possession usually works like this:

noun + possessor

So:

• adik perempuan saya = my younger sister
• literally: younger sister my

This is normal Malay word order. Other examples:

• rumah saya = my house
• ibu saya = my mother
• kawan saya = my friend

Kesejukan means something like feeling cold, being too cold, or suffering from the cold.

It comes from the root:

• sejuk = cold / cool

With ke-...-an, it often gives the idea of being affected by a condition, especially in an unpleasant way.

So:

• sejuk = cold
• kesejukan = to feel cold / to become chilled / to be affected by the cold

In this sentence, it describes your younger sister's condition.

Sejuk is the basic word cold/cool.

• Air itu sejuk. = The water is cold.

Kesejukan suggests a stronger, more personal experience:

• feeling cold
• getting chilled
• being affected by cold

So in this sentence, kesejukan sounds more natural than plain sejuk because it describes someone who became cold after being in the rain.

A rough comparison:

• Dia sejuk. = She is cold.
• Dia kesejukan. = She is feeling cold / She got chilled.

Kehujanan means to get caught in the rain or to be rained on.

It comes from:

• hujan = rain

With ke-...-an, it means being affected by rain, usually unintentionally.

So:

• Saya kehujanan. = I got caught in the rain.
• Mereka kehujanan semasa berjalan pulang. = They got caught in the rain while walking home.

It does not mean simply it was raining. It means the person experienced the rain directly.

Because ke-...-an is a common Malay pattern that can show someone is affected by something or is in a certain condition.

In this sentence:

• kesejukan = affected by cold
• kehujanan = affected by rain / caught in the rain

This pattern often gives the sense that something happened to the person, often in a way that is inconvenient or unpleasant.

Other similar examples:

• kepanasan = too hot / suffering from heat
• keletihan = exhausted / affected by tiredness
• kelaparan = hungry / suffering from hunger

Selepas means after.

So:

• selepas kehujanan = after getting caught in the rain

It shows time, not direct cause.

However, in a sentence like this, English speakers may feel a causal meaning too, because the cold feeling happened after the rain. But grammatically, selepas still means after, not because.

If you wanted to say because of getting caught in the rain, Malay would more likely use:

• kerana kehujanan
• sebab kehujanan

Also, lepas can often be used instead of selepas in less formal speech.

Di luar rumah means outside the house or outdoors, outside the home.

Breakdown:

• di = at / in / on
• luar = outside
• rumah = house / home

So:

• di luar rumah = outside the house

A useful spelling point:

• di is written separately when it is a preposition of place: di luar, di rumah, di sekolah
• it is written together only when it is a passive prefix: ditulis, dibuka

No. Malay often does not use a separate verb like to be in sentences like this.

So:

• Adik perempuan saya kesejukan
  naturally means My younger sister is/was cold or My younger sister felt cold

Malay often allows adjectives or stative forms to act directly as the predicate.

English needs is/was, but Malay usually does not.

Malay does not mark tense the way English does.

This sentence has no special verb ending for past or present. Time is understood from:

• context
• time words
• logic of the sentence

Here, selepas kehujanan helps show the sequence of events, but the sentence could still be translated in different ways depending on context:

• My younger sister felt cold after getting caught in the rain outside the house.
• My younger sister is cold after getting caught in the rain outside the house.

Both can be possible depending on the situation.

Yes, absolutely.

Adik saya kesejukan is a natural shorter version if the listener already knows that adik is female, or if gender is not important.

Use:

• adik saya = my younger sibling
• adik perempuan saya = my younger sister

So adding perempuan gives extra clarity, but it is not always necessary.

Most naturally, di luar rumah is understood with kehujanan:

• she got caught in the rain outside the house

Then, as a result, she felt cold.

So the sentence is understood as:

• My younger sister felt cold after getting caught in the rain outside the house.

In real usage, Malay often leaves this kind of attachment to context, and listeners usually understand it without trouble.