An Indonesian adjective can serve as a complete predicate: Saya lapar means “I am hungry,” and Mereka sibuk means “They are busy.” There is no ordinary present-tense copula corresponding to English am/is/are. The adjective itself states the condition or property.
This direct predication explains why Indonesian adjectives pattern partly like stative verbs. They combine with tidak “not,” time expressions, and markers such as sudah “already,” masih “still,” and belum “not yet.” This page develops those clause patterns while leaving adjective vocabulary and full derivational-affix paradigms to dedicated pages.
Subject plus adjective
The basic order is:
subject + adjective predicate
Saya lapar karena belum sarapan.
I am hungry because I have not eaten breakfast.
Rina sibuk sampai sore.
Rina is busy until late afternoon.
Kami senang bisa bertemu lagi.
We are happy to meet again.
Semua peserta siap memulai pelatihan.
All participants are ready to begin the training.
The required states lapar, sibuk, senang, and siap need no adalah. English inserts be to carry tense and agreement; Indonesian instead lets the property word head the predicate directly.
Why the copula is zero
In an ordinary property clause, adjacency is enough to establish the relation: the subject is followed by what is true of it.
Kamar ini bersih, tetapi kamar mandinya sempit.
This room is clean, but the bathroom is narrow.
Jalanan licin setelah hujan.
The roads are slippery after the rain.
Adding adalah does not make these clauses more complete. Kamar ini adalah bersih is not the normal Standard Indonesian property construction. Adalah is used chiefly in definitional or identificational statements (formal), especially before noun phrases: Fotosintesis adalah proses... “Photosynthesis is a process...” It is not a general translation of English be.
This is a structural difference, not casual omission. Careful formal Indonesian also says Ruang rapat sudah siap, without adalah.
Time comes from context and time expressions
The adjective has no tense ending. Context or an explicit time phrase locates the state.
Kemarin saya sakit, tetapi hari ini sudah sehat.
Yesterday I was ill, but today I am well again.
Besok pagi saya mungkin sibuk.
I may be busy tomorrow morning.
Saat kami tiba, pintunya masih terbuka.
When we arrived, the door was still open.
The same sakit, sibuk, or terbuka form can describe past, present, or future time. Indonesian does not change the adjective to agree with time or person. The listener uses kemarin, hari ini, besok, and the larger discourse.
Aspect and state markers
Markers placed before the adjective show how a state relates to an earlier expectation or time:
| Marker | Example | Interpretation |
|---|---|---|
| sudah | sudah siap | ready now; expected transition completed |
| belum | belum siap | not ready yet |
| masih | masih sibuk | still busy; state continues |
| akan | akan sibuk | will be busy |
Makanannya sudah siap; silakan duduk.
The food is ready; please have a seat.
Saya belum siap membicarakan masalah itu.
I am not ready to discuss that issue yet.
Dokter masih sibuk dengan pasien lain.
The doctor is still busy with another patient.
Anak-anak akan senang mendengar kabar ini.
The children will be happy to hear this news.
These markers precede the adjective phrase because they scope over the state. Sudah sangat siap is possible: sudah locates the state relative to an expectation, while sangat gives its degree.
Negate properties with tidak
Use tidak before an adjective for ordinary property negation.
Saya tidak lapar; saya hanya haus.
I am not hungry; I am only thirsty.
Rina tidak sibuk siang ini.
Rina is not busy this afternoon.
Mereka tidak senang dengan hasil rapat.
They are not happy with the meeting result.
Bukan normally rejects nominal identity: Dia bukan dokter “He/She is not a doctor.” It is not the default negator for a property, so say tidak lapar, not bukan lapar.
There is a real contrastive exception: Bukan lapar, hanya bosan means “Not hungry—just bored,” correcting the label someone has proposed. That marked correction does not replace the ordinary negative clause Saya tidak lapar. The negation guide develops this distinction.
Subject omission
When the subject is already obvious, Indonesian can omit it.
A: Sudah siap? B: Sudah, ayo berangkat.
A: Are you ready? B: Yes, let's go.
Maaf, masih sibuk. Bisa telepon lagi nanti?
Sorry, I'm still busy. Can you call again later?
Lapar? Kita makan dulu.
Hungry? Let's eat first.
The adjective does not reveal who is hungry or ready through agreement. Context does. In the dialogue, the addressee is understood in the question and the respondent in the answer. Keep the subject when several possible experiencers compete or when contrast matters: Saya sudah siap, tetapi Rina belum.
Adjective predicates resemble stative verbs—but are not identical
Like stative verbs, adjective predicates can stand without be, take tidak, and combine with aspect-like markers. That similarity helps English speakers stop searching for a copula. Yet adjectives also modify nouns directly and accept degree expressions particularly freely. Indonesian word classes have overlapping behaviors, not one-to-one English equivalents.
Deriving verbs from property roots can add causative or other meanings, but those productive affix patterns belong to the word-formation pages. In all derived forms, affixes attach according to EYD V.
Orthography
Write markers and negators separately from the adjective: sudah siap, masih sibuk, tidak lapar. Attach productive affixes in derived words, and hyphenate full reduplication such as besar-besar. Normal Standard Indonesian examples use unaccented EYD V spelling.
Common Mistakes
1. Adding adalah to a simple property
❌ Saya adalah lapar sekarang.
Incorrect ordinary adjective predicate — adalah is not English am.
✅ Saya lapar sekarang.
I am hungry now.
2. Negating an adjective with bukan
❌ Rina bukan sibuk hari ini.
Incorrect ordinary property negation.
✅ Rina tidak sibuk hari ini.
Rina is not busy today.
3. Using sudah as a generic past marker
Sudah contributes “already” or a completed transition; it is not a generic past-tense marker. Use an explicit time phrase alone for a simple past state.
✅ Kemarin kami senang bertemu mereka.
Yesterday we were happy to meet them.
✅ Rina sudah sehat ketika kami mengunjunginya.
Rina was already well when we visited her.
4. Putting the aspect marker after the adjective
❌ Makanannya siap sudah.
Incorrect neutral order — sudah precedes the state it scopes over.
✅ Makanannya sudah siap.
The food is ready.
5. Omitting an ambiguous subject
Rina menelepon Sari saat sedang sibuk is grammatical, but it can leave unclear which person was busy. Repeat the intended subject when that distinction matters.
✅ Rina menelepon Sari saat Rina sedang sibuk.
Rina called Sari while Rina was busy.
✅ Rina menelepon Sari saat Sari sedang sibuk.
Rina called Sari while Sari was busy.
Key Takeaways
- Build property clauses as subject + adjective: Saya lapar.
- Ordinary adjective predicates need neither adalah nor English-style be.
- Time and aspect markers precede the unchanged adjective: sudah siap, masih sibuk.
- Use tidak for ordinary property negation.
- Subjects may be omitted only when context identifies them clearly.
Now practice Indonesian
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Start learning Indonesian →Related Topics
- Indonesian Adjectives: Modifier and PredicateA1 — Use one unchanged Indonesian adjective form after a noun or directly as a predicate, without agreement or an ordinary copula.
- Negating AdjectivesA2 — Choose tidak, belum, or contrastive bukan to distinguish a denied state, an incomplete transition, and a corrected category.
- Adjectival SentencesA1 — Use adjectives as complete predicates with tidak, degree words, aspect markers, and experiencer subjects.
- 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.
- bukan with Nouns and Contrastive CorrectionA1 — Use bukan to reject noun identities and correct a focused alternative with melainkan or conversational tapi.
- Ordering Aspect and Modal MarkersB2 — Build and interpret Indonesian marker chains by reading each word's scope over what follows, especially around negation, prospect, ability, and aspect.