English can put less before an adjective: “less tall,” “less strong,” “less expensive.” Hausa normally puts inferiority in the verb. The verb kasa means “fall short of” in a comparison, while negative kai says that the subject “does not reach/equal” the standard: Na kasa ka tsawo and Ban kai ka tsawo ba both mean “I am less tall than you.”
All unlabelled examples are (neutral Nigerian Standard Hausa). Notice the spelling: comparative kasa has plain k. It is not the noun or locational word ƙasa “ground, country; below.” The hooked letter changes the word.
This page reverses the ranking taught in Comparatives with fi and builds directly on Equality with kai and kamar.
The verbal pattern with kasa
The core order matches a comparison with fi:
subject + completive subject marker + kasa + standard + property noun
Musa ya kasa Ali tsawo.
Musa is less tall than Ali.
Amina ta kasa Zainab tsawo.
Amina is less tall than Zainab.
Waɗannan akwatunan sun kasa waɗancan nauyi.
These boxes are lighter than those ones.
Masculine ya, feminine ta, and plural sun agree with the subject. The standard comes immediately after kasa, and the property follows as a quality noun: tsawo “height,” nauyi “weight,” ƙarfi “strength,” or sauri “speed.”
| Subject | Marker | Example |
|---|---|---|
| masculine singular | ya | Yaron ya kasa yayansa tsawo. |
| feminine singular | ta | Yarinyar ta kasa yayarta tsawo. |
| plural | sun | Yaran sun kasa iyayensu tsawo. |
Yaron ya kasa yayansa tsawo, amma ya fi shi sauri.
The boy is shorter than his older brother, but he is faster.
Bakwai ya kasa takwas.
Seven is less than eight.
The numerical example needs no final property noun because the scale is simply numerical value. With people or objects, state tsawo, ƙarfi, nauyi, or another scale when context does not already identify it.
Negative kai: “not reach the standard”
The same comparison can be framed as failed equality. The negative completive marker agrees with the subject, and final ba closes the negation.
Musa bai kai Ali tsawo ba.
Musa is not as tall as Ali.
Amina ba ta kai Zainab tsawo ba.
Amina is not as tall as Zainab.
Waɗannan igiyoyin ba su kai waɗancan tsawo ba.
These ropes are not as long as those ones.
The forms are bai ... ba for masculine singular, ba ta ... ba for feminine singular, and ba su ... ba for plural. With first person, use ban ... ba:
Ban kai ka ƙarfi ba, don haka ka taimaka mini da akwatin.
I am not as strong as you, so help me with the box. (to one male)
This construction often sounds less categorical than a direct English “X is inferior to Y.” It simply denies that X reaches Y on the stated scale. Context supplies whether the difference is slight or large.
Kasa and negative kai are close, not mechanically identical
Both constructions yield an inferiority comparison, but their viewpoints differ. Kasa positively presents the subject as falling short. Bai kai ... ba denies equality with a benchmark. This makes negative kai especially natural when someone has proposed or expected equality.
Na ɗauka tankin nan ya kai wancan girma, amma bai kai shi ba.
I thought this tank was as large as that one, but it is not.
Tankin nan ya kasa wancan girma; ba zai ɗauki ruwan duka ba.
This tank is smaller than that one; it will not hold all the water.
The omitted scale in bai kai shi ba is recoverable from girma in the preceding clause. Omission is natural when both the standard and dimension are already clear, but a learner should state the scale when ambiguity is possible.
The comparison is a clause, not an agreeing adjective
True adjectives still agree when they occur in a separate description:
Yaron gajere ne; bai kai yayansa tsawo ba.
The boy is short; he is not as tall as his older brother.
Yarinyar gajeriya ce; ba ta kai yayarta tsawo ba.
The girl is short; she is not as tall as her older sister.
Yaran gajeru ne; ba su kai iyayensu tsawo ba.
The children are short; they are not as tall as their parents.
The adjective series gajere/gajeriya/gajeru agrees, and the copula is ne/ce/ne. By contrast, tsawo inside the kai clause is an invariant noun. Do not create feminine or plural versions of tsawo.
Many property concepts are quality nouns rather than true adjectives:
Sabuwar igiyar tana da ƙarfi, amma ba ta kai tsohuwar ƙarfi ba.
The new rope is strong, but it is not as strong as the old one.
Here feminine tana da predicates ƙarfi, then feminine negative ba ta kai ... ba compares it. English uses strong in both places, but Hausa changes the structure because one clause attributes a quality and the other compares its degree.
Attributive comparisons use a relative clause
An English phrase such as “a box lighter than that one” can tempt learners to put an entire comparison before the noun. Hausa normally keeps the comparison as a clause modifying the noun.
Ka kawo akwatin da bai kai wancan nauyi ba.
Bring a box that is lighter than that one.
Muna son mota wadda ba ta kai wannan tsada ba.
We want a car that is less expensive than this one.
Sun zaɓi kayan da ba su kai na farko nauyi ba.
They chose materials that were lighter than the first ones.
The relative forms da/wadda attach a full comparison to the head noun. In a simple predicate no relative marker is needed: Motar ba ta kai wannan tsada ba “The car is less expensive than this one.”
Do not confuse kasa with ƙasa da
Ƙasa da—with hooked ƙ—means “below/under” and commonly sets a numerical upper boundary. It does not take a standard and a property noun in the verbal kasa pattern.
Yaron yana da shekaru ƙasa da goma.
The boy is under ten years old.
Farashin ya sauka zuwa ƙasa da naira dubu biyar.
The price fell to below five thousand naira.
Compare Bakwai ya kasa takwas “Seven is less than eight,” a verbal comparison, with ƙasa da takwas “under eight,” a boundary phrase. The spelling and syntax are both different.
A natural judgment in context
A ganina, ɗaki na biyu bai kai na farko faɗi ba, amma ya fi shi haske.
In my view, the second room is less spacious than the first, but it is brighter.
The first comparison uses negative kai plus quality noun faɗi; the second reverses the ranking with fi plus haske. Hausa keeps the property words unchanged and lets the comparison verbs express equal, lower, or higher degree.
Practice
Say each comparison first with kasa, then with negative kai.
Na kasa ka sauri. Ban kai ka sauri ba.
I am slower than you. I am not as fast as you.
Motar ta kasa motarka ƙarfi. Ba ta kai motarka ƙarfi ba.
The car is less powerful than yours. It is not as powerful as yours.
Kujerun sun kasa waɗancan nauyi. Ba su kai waɗancan nauyi ba.
The chairs are lighter than those. They are not as heavy as those.
Common Mistakes
1. Writing hooked ƙ in the comparison verb
❌ Musa ya ƙasa Ali tsawo.
Incorrect — comparative kasa begins with plain k.
✅ Musa ya kasa ɗan’uwansa tsawo.
Musa is less tall than his brother.
2. Omitting the final negative ba
❌ Amina ba ta kai Zainab tsawo.
Incorrect — the standard negative frame closes with ba.
✅ Amina ba ta kai ƙawarta tsawo ba.
Amina is not as tall as her friend.
3. Copying English less before an adjective
❌ Musa less dogo ne da Ali.
Incorrect — neither English less nor this mixed adjective frame belongs here.
✅ Musa bai kai abokinsa tsawo ba.
Musa is less tall than his friend.
4. Using masculine agreement with a feminine subject
❌ Motar bai kai wannan tsada ba.
Incorrect — mota is feminine.
✅ Motar ba ta kai wannan tsada ba.
The car is less expensive than this one.
Key Takeaways
- Comparative kasa means “fall short of” and begins with plain k.
- Negative kai means “not reach/equal”: bai / ba ta / ba su kai ... ba.
- The standard follows the verb, and an invariant property noun names the scale.
- Put an attributive inferiority comparison in a relative clause rather than before the noun.
- Ƙasa da with hooked ƙ is a separate “under/below” boundary phrase.
Related Topics
- Comparatives with fiB1 — Build Hausa greater-than comparisons with the stative verb fi, an agreeing subject marker, a standard, and a scale expression.
- Equality with kai and kamarB1 — Compare equal degrees with the stative verb kai, and express looser similarity with kamar.
- The Standard of Comparison after fiB1 — Choose and place the noun phrase, pronoun, demonstrative, or recoverable alternative that serves as the standard after Hausa fi.
- How Hausa Expresses PropertiesA1 — Choose among true adjectives, mai or masu phrases, quality nouns, and verbal expressions when describing people and things in Hausa.
- Kaɗan: Few and LittleA2 — Use postnominal kaɗan for a small number, a small amount, or a low degree without English's many/much split.