An Indonesian adjective can be the complete predicate of a clause. Rumah itu besar means “That house is big” with no form of be, and the adjective never agrees with the subject in person, number, or gender.
This simple structure also supports negation, degree, and aspect-like markers. It is especially important for physical and emotional experiences, where Indonesian often uses a person as the subject followed directly by an adjective.
The adjective-predicate guide places this sentence pattern within the wider Indonesian adjective system.
The core pattern
The neutral adjectival clause is:
subject + adjective predicate
The required model Rumah itu besar shows the whole pattern. A longer natural clause uses the same structure:
Rumah itu besar dan memiliki halaman yang teduh.
That house is big and has a shady yard.
Kamar tamunya sempit, tetapi sangat rapi.
The guest room is narrow but very tidy.
Jalan menuju pantai licin setelah hujan.
The road to the beach is slippery after rain.
Anak-anak itu tenang selama pertunjukan.
Those children were quiet during the performance.
There is no special plural form of tenang, no past form of licin, and no third-person ending on besar. Time and context supply interpretations that English expresses through was, were, or will be.
Kemarin ruang tunggunya sangat penuh.
Yesterday the waiting room was very full.
Besok jadwal kami lebih longgar.
Tomorrow our schedule will be less packed.
Negating an adjective with tidak
Use tidak before an adjective to deny a property or state.
Kopi ini tidak pahit meskipun tanpa gula.
This coffee is not bitter even without sugar.
Kamar mandi di lantai dua tidak bersih.
The bathroom on the second floor is not clean.
Jawaban itu tidak tepat untuk pertanyaan ini.
That answer is not right for this question.
Saya tidak yakin alamatnya masih sama.
I am not sure that the address is still the same.
Bukan normally rejects a noun identity: Dia bukan dokter. It does not replace tidak before an ordinary adjective. Bukan can contrastively reject an adjective phrase—Bukan mahal, tetapi sulit ditemukan “Not expensive, but hard to find”—but that corrective construction is not the neutral negative tidak mahal.
Degree words before and after the adjective
Degree expressions tell how strongly the property applies. Several common ones precede the adjective:
| Pattern | Meaning | Register |
|---|---|---|
| sangat + adjective | very | neutral |
| cukup + adjective | fairly / sufficiently | neutral |
| agak + adjective | somewhat | neutral |
| terlalu + adjective | too / excessively | neutral |
| adjective + sekali | very | neutral |
Ruang baca itu sangat tenang pada sore hari.
That reading room is very quiet in the afternoon.
Airnya cukup hangat untuk mandi.
The water is warm enough for a bath.
Suara dari pengeras suara itu agak pelan di baris belakang.
The sound from that loudspeaker is somewhat quiet in the back row.
Ransel sebesar ini terlalu berat untuk dibawa sendiri.
A backpack this large is too heavy to carry alone.
The required pattern Makanannya enak sekali places sekali after the adjective:
Makanannya enak sekali, terutama sup ikannya.
The food is very tasty, especially the fish soup.
The two neutral orders are sangat enak and enak sekali. Standard Indonesian does not normally use English-like comparative endings or change the adjective's shape.
Aspect markers with states
Words often taught as aspect markers can locate a state relative to change. They precede the adjective predicate.
The brief's required clause Saya belum siap means that readiness is expected but has not been reached yet.
Saya belum siap berangkat karena tiketnya belum ditemukan.
I am not ready to leave because the ticket has not been found yet.
Adik masih sakit dan perlu beristirahat di rumah.
My younger sibling is still sick and needs to rest at home.
Ruang rapat sudah kosong setelah makan siang.
The meeting room is already empty after lunch.
Jalannya sekarang lebih lebar daripada tahun lalu.
The road is wider now than it was last year.
Masih sakit presents the illness as continuing. Sudah kosong presents emptiness as a reached state. Belum siap combines negation with an expectation of eventual readiness. English changes forms of be and may add still, already, or not yet; Indonesian keeps the adjective fixed.
Experiential subjects
Indonesian commonly places the person experiencing a bodily or emotional state in subject position, followed directly by an adjective. English usually inserts be or feel.
Saya lapar setelah perjalanan panjang.
I am hungry after the long journey.
Rani takut naik lift sendirian.
Rani is afraid to take the elevator alone.
Kami senang mendengar kabar baik itu.
We are happy to hear the good news.
Ayah lelah setelah mengemudi sepanjang malam.
Dad is tired after driving all night.
Anak itu malu berbicara di depan kelas.
That child is shy about speaking in front of the class.
Do not add a subjectless verb equivalent to “feels.” Saya lapar already attributes hunger to saya. A separate verb is possible when its meaning matters—Saya merasa lelah “I feel tired”—but it is longer and puts attention on subjective perception.
Some English adjectives map to Indonesian verbs or derived predicates rather than simple adjectives. Vocabulary still matters; the productive syntactic lesson is that a genuine adjective can head the predicate without a copula.
Adjective predicate versus noun modifier
After a noun, an adjective can be part of that noun phrase or can be the clause predicate. Context and intonation help, and demonstratives often reveal the boundary.
Saya mencari kamar murah dekat stasiun.
I am looking for a cheap room near the station. (murah modifies kamar)
Kamar dekat stasiun itu murah.
That room near the station is cheap. (murah is the predicate)
Mereka menjual roti segar setiap pagi.
They sell fresh bread every morning. (segar modifies roti)
Roti di toko itu selalu segar.
The bread at that shop is always fresh. (segar is the predicate)
The demonstrative itu closes the subject phrase in kamar dekat stasiun itu, making the following adjective easier to recognize as the predicate.
Questions and short answers
An adjectival clause can become a yes–no question through intonation, or bagaimana can ask for a description.
Kamarnya cukup luas untuk tiga orang?
Is the room spacious enough for three people?
Bagaimana kondisi jalan ke desa itu?
What is the condition of the road to that village?
Jalannya sempit, tetapi tidak terlalu rusak.
The road is narrow but not too damaged.
No question auxiliary or copula is required. The predicate structure remains intact.
Common Mistakes
Adding adalah before an ordinary adjective
❌ Apartemen mereka adalah luas dan terang.
Incorrect neutral predicate — luas and terang need no copula.
✅ Apartemen mereka luas dan terang.
Their apartment is spacious and bright.
Using bukan as the neutral adjective negator
❌ Tehnya bukan panas lagi.
Incorrect intended neutral negation — use tidak before panas.
✅ Tehnya tidak panas lagi.
The tea is no longer hot.
Inventing adjective agreement
❌ Rumah-rumah di bukit itu besar-besaran.
Incorrect intended meaning — besar-besaran does not mean plural big; it means on a large scale.
✅ Rumah-rumah di bukit itu besar.
The houses on that hill are big.
Putting sekali before the adjective
❌ Pemandangan dari balkon sekali indah.
Incorrect neutral degree order — sekali follows the adjective.
✅ Pemandangan dari balkon indah sekali.
The view from the balcony is very beautiful.
Importing English be with an experiential subject
❌ Saya am gugup sebelum wawancara.
Incorrect — Indonesian does not use English am before an adjective.
✅ Saya gugup sebelum wawancara.
I am nervous before the interview.
Key Takeaways
- An adjective directly after its subject forms a complete predicate without adalah.
- Adjectives do not agree with person, gender, number, or tense.
- Use tidak for neutral adjective negation; bukan has a contrastive role but is not the default.
- Degree words occupy conventional positions: sangat enak but enak sekali.
- Masih, sudah, and belum locate a state relative to continuation or change while the adjective remains unchanged.
Now practice Indonesian
Reading grammar gets you part of the way. The exercises are where it sticks — free, no signup needed.
Start learning Indonesian →Related Topics
- Indonesian Sentence Types: An OverviewA1 — Recognize declarative, interrogative, imperative, and exclamative sentences and the predicate patterns that build them.
- Adjective Predicates and Zero CopulaA1 — Build Indonesian property clauses directly with subject plus adjective, adding aspect, time, or tidak without an ordinary copula.
- sangat, amat, and sekaliA2 — Intensify Indonesian adjectives with pre-adjective sangat or amat and post-adjective sekali, including emphatic combinations.
- Negating AdjectivesA2 — Choose tidak, belum, or contrastive bukan to distinguish a denied state, an incomplete transition, and a corrected category.
- tidak with Verbs and AdjectivesA1 — Use tidak before verbal and adjectival predicates, control its scope with modals and frequency words, and answer negative questions naturally.
- masih: Still and Continuing StateA1 — Use masih to present an earlier activity, state, location, identity, or remaining quantity as continuing at the reference time.