Kalau saya mengabaikan mesej dia, dia mudah terasa kerana dia sangat sensitif.

Kalau and jika both mean “if” in this kind of sentence.

• Kalau: more informal / conversational, used all the time in speech.
• Jika: more formal / written, used in writing, official documents, exams, etc.

You can say:

• Kalau saya mengabaikan mesej dia… (neutral, spoken)
• Jika saya mengabaikan mesej dia… (a bit more formal)

In everyday conversation, kalau is more natural.

Kalau can mean both “if” (conditional) and sometimes “when” (in the sense of “whenever / if ever”).

In this sentence:

• Kalau saya mengabaikan mesej dia…
  → clearly “If I ignore his/her message…” (a condition that may or may not happen).

Another example where it feels more like “when/whenever”:

• Kalau saya penat, saya tidur awal.
  → “When(ever) I’m tired, I sleep early.”

Context tells you whether it’s closer to “if” or “when”.

Mengabaikan means “to ignore / to neglect (something)”.

It’s built like this:

• Root: abai = to neglect / to ignore
• Prefix: meN- (here it becomes meng-)
• Suffix: -kan

So: meN- + abai + -kan → mengabaikan

You’ll often see:

• mengabaikan mesej – ignore a message
• mengabaikan tanggungjawab – neglect responsibilities

You could also hear more casual alternatives like:

• tak layan mesej dia – “don’t entertain / don’t respond to his/her message”
• buat tak tahu mesej dia – “pretend not to notice his/her message”

Malay doesn’t mark gender in third-person singular pronouns:

• dia can mean he, she, him, her.
• mesej dia = his message or her message (context decides).

In conversation, people usually already know who dia refers to, so there is no confusion.

You can also say:

• mesejnya – more compact, slightly more formal/literary: “his/her message”
  → Kalau saya mengabaikan mesejnya…

But mesej dia is perfectly natural in speech and informal writing.

Literally:

• dia = he/she
• mudah = easily
• terasa = “to feel something”, “to feel affected”

In this expression, dia mudah terasa means:

• “he/she is easily offended / easily hurt (emotionally)”

Terasa by itself is broader:

• Saya terasa lapar. – I feel hungry.
• Saya terasa sedih. – I feel sad.

But in the common phrase mudah terasa, it almost always carries the nuance of being easily offended / taking things to heart.

Yes, mudah is the standard word for “easy” and also “easily”.

Here:

• dia mudah terasa
  → literally “he/she easily feels (hurt/offended)”

Other examples:

• Dia mudah marah. – He/she gets angry easily.
• Dia mudah penat. – He/she gets tired easily.

So mudah + verb / adjective is a common pattern for “easily X”.

Both kerana and sebab can mean “because” in everyday usage.

• Kerana dia sangat sensitif.
• Sebab dia sangat sensitif.

In speech:

• sebab is very common, informal.
• kerana is slightly more formal/neutral, common in writing.

So you can say:

• …dia mudah terasa sebab dia sangat sensitif.

In very formal writing, kerana is usually preferred.

In the sentence:

• Kalau saya mengabaikan mesej dia, dia mudah terasa kerana dia sangat sensitif.

dia appears 3 times, but this is normal and clear in Malay.

You could reduce one instance:

• Kalau saya mengabaikan mesej dia, dia mudah terasa kerana sangat sensitif.
  → Drop the last dia; meaning is still clear (“because (he/she) is very sensitive”).

A slightly more natural variation:

• Kalau saya mengabaikan mesej dia, dia mudah terasa sebab dia memang sensitif.
  (added memang = “really / indeed”, often used in conversation)

But repeating dia is not wrong or strange; it ensures clarity.

Malay doesn’t mark tense with verb forms the way English does.

• Kalau saya mengabaikan mesej dia…
  Can mean:
  • “If I ignore his/her message…”
  • “If I ever ignore his/her message…”
  • “If I have ignored his/her message (on any occasion)…”

Context and time expressions (like nanti, tadi, esok, selalu) usually clarify:

• Kalau nanti saya mengabaikan mesej dia… – If I (later) ignore…
• Kalau saya selalu mengabaikan mesej dia… – If I always ignore…

You can optionally add akan to emphasize a future result:

• Kalau saya mengabaikan mesej dia, dia akan mudah terasa.
  → “If I ignore his/her message, he/she will easily get offended.”

Sensitif is a loanword from English “sensitive”, but it’s fully accepted and very common in modern Malay.

It can describe:

• emotions: dia sangat sensitif – very sensitive (emotionally)
• physical sensitivity: kulit saya sensitif – my skin is sensitive

More “native” alternatives (depending on nuance):

• mudah tersinggung – easily offended
• perasa – very emotional / sensitive (about feelings)
• lembut hati – soft-hearted (not exactly the same, more positive)

In this sentence, sangat sensitif is natural and idiomatic.