Classes 9 and 10 are often called the N-class pair because a historical nasal prefix shapes many nouns and adjectives. In a finished adjective, however, that nasal is not always visible as the literal letter n. It may combine with the stem's first consonant, change that consonant, or have no separate written segment: -zuri → nzuri, -refu → ndefu, -pya → mpya, but -kubwa → kubwa.
The same adjective form normally serves class 9 singular and class 10 plural. Nyumba kubwa can therefore mean “a large house” or “large houses”; demonstratives, verbs, possessives, and context reveal the number. All unlabelled examples here belong to neutral (informal) and (formal) Standard Swahili.
N- is a label for a pattern, not a typing instruction
The most useful N-class adjectives are best learned as whole surface forms.
| Citation stem | N-class form | Example phrase |
|---|---|---|
| -zuri | nzuri | habari nzuri |
| -dogo | ndogo | nyumba ndogo |
| -refu | ndefu | barua ndefu |
| -baya | mbaya | habari mbaya |
| -pya | mpya | nguo mpya |
| -gumu | ngumu | kazi ngumu |
| -kubwa | kubwa | nyumba kubwa |
| -fupi | fupi | barua fupi |
| -ema | njema | nia njema |
| -eupe | nyeupe | nguo nyeupe |
| -ingine | nyingine | njia nyingine |
Tumepokea habari njema kutoka kwa daktari asubuhi hii.
We received good news from the doctor this morning.
Alinitumia barua ndefu akieleza kwa nini alihama.
She sent me a long letter explaining why she moved.
Forms such as nzuri, ndefu, and mpya are not spelling mistakes beside an imagined regular nrefu or npya. The nasal and following sound have produced conventional Standard Swahili outcomes. Some forms, such as kubwa and fupi, look identical to a bare stem; their lack of an extra written nasal does not make them agreement-free.
Singular and plural share the adjective form
Many class 9/10 nouns also have the same noun form in both numbers. Compare the entire agreement chain, not just the noun plus adjective.
Nyumba hii ndogo imefungwa kwa sababu paa linavuja.
This small house has been closed because the roof leaks.
Nyumba hizi ndogo zimefungwa mpaka ukarabati ukamilike.
These small houses have been closed until the repairs are completed.
The adjective remains ndogo. Number appears in class 9 hii, i-me- versus class 10 hizi, zi-me-. The same contrast appears in possessives: nyumba yangu nzuri “my good house” versus nyumba zangu nzuri “my good houses.”
Barua yangu fupi imefika, lakini barua zako ndefu zimechelewa.
My short letter has arrived, but your long letters are delayed.
English marks number on “house/houses” and often nowhere else. Swahili may keep nyumba and ndogo unchanged while moving the number signal onto several concord targets. That distributed marking is normal, not an omission.
Why the surface forms differ
The nasal historically adapted to the place and manner of the following consonant. Before b it appears as m in mbaya; before g it appears as ng in ngumu. With r, the established result in -refu is ndefu. Before some consonants, including the initial sounds of -kubwa and -fupi, no separate nasal is written in the completed adjective.
Kazi ngumu imekamilika mapema kwa sababu tulishirikiana.
The difficult job was completed early because we worked together.
Nguo mpya ni kubwa kidogo, lakini fundi anaweza kuirekebisha.
The new garment is slightly large, but the tailor can adjust it.
This is a description of the pattern learners encounter, not a license to apply a new sound law to any loan or invented adjective. Established true adjective stems have established N-class forms. Invariable modifiers such as safi, ghali, and rahisi remain unchanged for a different reason: they do not enter the regular adjective-concord paradigm at all.
Vowel-initial N-class forms
Vowel-initial stems produce another recognizable set: -ema → njema, -eupe → nyeupe, -ekundu → nyekundu, -epesi → nyepesi, and -ingine → nyingine. These must not be reduced to nema, neupe, or ningine.
Nia njema hazitoshi bila mpango unaotekelezeka.
Good intentions are not enough without a workable plan.
Tumechagua njia nyingine kwa kuwa daraja limefungwa.
We have chosen another route because the bridge is closed.
The vowel-initial adjective page compares the same stems across other noun classes, where forms such as chema, vyema, jema, and mema make the prefix interaction visible in different ways.
N-class adjectives versus alternative property phrases
Do not manufacture an N-class adjective for every English property word. Choose a true adjective only when Swahili has that stem. A “spacious house” is naturally nyumba yenye nafasi, using class 9 yenye, while a “stone house” is nyumba ya mawe, using class 9 associative ya.
Tuliona nyumba kubwa yenye ua wa mawe karibu na soko.
We saw a large house with a stone courtyard near the market.
Here kubwa is the N-class true adjective, yenye belongs to the -enye series, and wa is controlled by class 11 ua. The three modifiers express size, possession of a feature, and material through different grammatical resources.
Ordinary nonhuman class 9/10 nouns are the focus of this page. Human and other animate nouns whose lexical noun class is 9/10 can show semantic agreement from the human series in parts of the concord chain. That important override is treated separately on the human agreement page; do not use an animal or personal noun as the model for an inanimate N-class table.
Common Mistakes
Using the bare adjective stem
❌ Tumepata nyumba zuri karibu na ofisi.
Incorrect — the N-class form of -zuri is nzuri.
✅ Tumepata nyumba nzuri karibu na ofisi ya posta.
We have found a good house near the post office.
Writing a literal n before the stem
❌ Ripoti nrefu imewasilishwa kwa kamati.
Incorrect — the established N-class form is ndefu.
✅ Ripoti ndefu imewasilishwa kwa kamati ya wilaya.
A long report has been submitted to the district committee.
Adding a nasal where the surface form has none
❌ Hoteli nkubwa imejengwa kando ya ziwa.
Incorrect — -kubwa surfaces as kubwa in classes 9/10.
✅ Hoteli kubwa imejengwa kando ya ziwa kwa watalii.
A large hotel has been built beside the lake for tourists.
Marking plural on the adjective but not elsewhere
❌ Nyumba hizi nzuri imeuzwa wiki hii.
Incorrect — class 10 hizi requires plural verbal zi-, even though nzuri is unchanged.
✅ Nyumba hizi nzuri zimeuzwa wiki hii baada ya mnada.
These good houses were sold this week after the auction.
Key Takeaways
Classes 9 and 10 use the same nasal-conditioned adjective forms, but the nasal has several surface outcomes: nzuri, ndogo, ndefu, mbaya, mpya, ngumu, and also apparently unprefixed kubwa or fupi. Vowel-initial stems give forms such as njema, nyeupe, and nyingine. Because singular and plural adjectives are identical, find number in demonstratives, possessives, verbs, or context. Above all, learn the finished form rather than treating the abstract label N- as literal spelling.
Now practice Swahili
Reading grammar gets you part of the way. The exercises are where it sticks — free, no signup needed.
Start learning Swahili →Related Topics
- Vowel-Initial Adjective StemsA2 — Form adjectives such as -ema, -eupe, and -ingine by applying the class-specific vowel and glide patterns.
- Adjective Position and Information PackagingA2 — Use postnominal adjectives by default and understand how sequencing, scope, and marked fronting change emphasis.
- Adjective Concord: Complete TableA2 — Form regular Swahili adjectives across the core noun-class pairs, including vowel-initial stems and N-class sound changes.
- Classes 9/10: N-Class NounsA1 — Use class 9/10 nouns whose singular and plural often look alike, with i-/zi- agreement and the nasal patterns common in this large class pair.
- How Swahili Marks Singular and PluralA1 — Understand number through noun-class pairings, agreement chains, unchanged class 9/10 nouns, and nouns without an ordinary plural.