The 20 Most Common Formal Indonesian Words You're Using Wrong in Daily Conversation

You learned Indonesian from a textbook. That's fine. Textbooks are great.

But here's the thing.. textbooks teach you formal Indonesian. The kind you'd use in a government speech or a news broadcast. Not the kind you'd use ordering coffee in Jakarta.

Real Indonesians don't talk like textbooks. They strip prefixes. They shorten words. They swap entire phrases for something punchier. And when you show up speaking full formal Bahasa Indonesia in a casual conversation, people notice. They'll understand you. But you'll sound.. off. Like someone reading from a script at a hangout.

This gap between textbook Indonesian and street Indonesian is huge. Bigger than most language courses admit. So here are 20 words you're probably saying the formal way when nobody else is.

The List

1. saya -> gue / aku (I) Formal: "Saya mau pergi." Casual: "Gue mau pergi." (Use aku with friends outside Jakarta. Gue is very Jakartan.)

2. Anda -> kamu / lo (you) Formal: "Anda dari mana?" Casual: "Lo dari mana?" (Anda is stiff. Even kamu is softer. Lo is Jakarta slang.)

3. tidak -> gak / nggak (no / not) Formal: "Saya tidak tahu." Casual: "Gue gak tahu."

4. sangat -> banget (very) Formal: "Sangat bagus." Casual: "Bagus banget." (Notice the word order flips. Banget comes after the adjective.)

5. sudah -> udah (already) Formal: "Sudah makan?" Casual: "Udah makan?"

6. sedang -> lagi (currently) Formal: "Saya sedang bekerja." Casual: "Gue lagi kerja."

7. bekerja -> kerja (to work) Formal: "Dia bekerja di bank." Casual: "Dia kerja di bank." (Drop the ber- prefix. Almost always.)

8. berbicara -> ngomong (to speak) Formal: "Saya ingin berbicara." Casual: "Gue mau ngomong."

9. memiliki -> punya (to have) Formal: "Dia memiliki dua anak." Casual: "Dia punya dua anak."

10. menggunakan -> pake (to use) Formal: "Menggunakan aplikasi ini." Casual: "Pake aplikasi ini." (Written as pakai formally, but spoken as pake.)

11. bagaimana -> gimana (how) Formal: "Bagaimana caranya?" Casual: "Gimana caranya?"

12. mengapa -> kenapa (why) Formal: "Mengapa Anda terlambat?" Casual: "Kenapa lo telat?" (Two swaps in one sentence. That's how it works in practice.)

13. terima kasih -> makasih (thank you) Formal: "Terima kasih banyak." Casual: "Makasih ya!"

14. silakan -> aja (please / go ahead) Formal: "Silakan duduk." Casual: "Duduk aja." (Aja roughly means "just go ahead and.." Very versatile.)

15. namun -> tapi (but / however) Formal: "Namun, dia tidak setuju." Casual: "Tapi dia gak setuju."

16. akan -> mau / bakal (will) Formal: "Saya akan pergi." Casual: "Gue mau pergi." or "Gue bakal pergi." (Mau leans toward wanting. Bakal is pure future tense.)

17. dapat -> bisa (can) Formal: "Anda dapat mencoba." Casual: "Lo bisa coba."

18. memberikan -> kasih (to give) Formal: "Tolong memberikan ini." Casual: "Kasih ini dong." (Dong is a softener. You'll hear it everywhere.)

19. membuat -> bikin (to make) Formal: "Dia membuat kue." Casual: "Dia bikin kue."

20. melihat -> liat (to see) Formal: "Saya melihat dia." Casual: "Gue liat dia."

Now What?

See the pattern? Casual Indonesian drops prefixes (ber-, me-, mem-), shortens common words, and swaps formal vocabulary entirely. It's not "wrong." It's just.. how people actually talk.

Start small. Pick five of these and use them in your next conversation. Mix them into your texting. Listen for them in Indonesian YouTube videos or podcasts.

The goal isn't to abandon formal Indonesian. You'll still need it for writing, presentations, and talking to your partner's parents (probably). But if you want to sound like a person and not a press release, these 20 swaps will get you most of the way there.

So.. which ones were you still saying the formal way? 🤔