Kukaa bila marafiki usiku kunaweza kuleta upweke.

The verb -kaa can mean several related things: sit, stay, live, or remain, depending on context.

In this sentence, kukaa is not mainly about physically sitting on a chair. It means something more like staying/being.

So kukaa bila marafiki usiku means being/staying without friends at night.

In Swahili, an infinitive verb can act like a noun, similar to English staying or being.

So:

• kukaa = to stay / staying
• kuleta = to bring / bringing

Here, kukaa bila marafiki usiku works as the subject of the sentence:

• Kukaa bila marafiki usiku = Being/staying without friends at night

This is very normal in Swahili.

Bila means without.

It is a preposition, so it is followed directly by a noun or noun phrase:

• bila marafiki = without friends
• bila pesa = without money
• bila usingizi = without sleep

There is no extra word needed between bila and the noun.

The singular is rafiki, meaning friend.

So:

• rafiki = friend
• marafiki = friends

In the sentence, marafiki is plural because it refers to friends in general.

Swahili does not use articles like English a, an, or the.

So marafiki can mean:

• friends
• the friends

The exact meaning depends on context. In this sentence, it simply means friends in a general sense.

Usiku means night, but it is often used adverbially to mean at night.

Swahili often uses time words without a preposition:

• asubuhi = in the morning
• mchana = during the day
• jioni = in the evening
• usiku = at night

So usiku here naturally means at night.

Kunaweza can be broken down like this:

• ku- = subject marker used with an infinitive idea or clause
• -na- = present tense
• -weza = be able / can

So kunaweza means can or it can.

In this sentence, the whole idea kukaa bila marafiki usiku is treated as the thing that can cause something. Swahili often uses ku- on the verb when the subject is an infinitive phrase like this.

So the structure is roughly:

• Kukaa bila marafiki usiku = Being without friends at night
• kunaweza = can
• kuleta upweke = bring loneliness

Because -weza means can / be able to, and in Swahili it is normally followed by another verb in the infinitive.

So:

• kuweza kuleta = to be able to bring
• anaweza kuja = he/she can come
• tunaweza kuona = we can see

That is why kuleta stays in the ku- infinitive form.

Yes, but in this sentence it is being used in a more abstract sense.

Kuleta literally means to bring, but it can also mean:

• cause
• lead to
• result in

So kuleta upweke means to bring about loneliness or simply to cause loneliness.

Upweke is a noun meaning loneliness.

It is an abstract noun, built from the idea of being alone or lonely. In English, it works like nouns such as sadness, kindness, or loneliness.

So:

• mpweke = a lonely person / someone alone
• upweke = loneliness

In this sentence, upweke is the result that may come from the situation described.

Yes, a little, especially with time words like usiku.

For example, you may also hear:

• Kukaa usiku bila marafiki kunaweza kuleta upweke
• Usiku, kukaa bila marafiki kunaweza kuleta upweke

These are close in meaning, but the original order is perfectly natural. Moving usiku changes the emphasis slightly, not the core meaning.

Yes. It sounds like a general statement or observation.

The present-tense/modal form kunaweza gives the sense of:

• can
• may
• is capable of

So the sentence is not saying loneliness always happens, but that this situation can cause it. That makes it sound general and realistic rather than absolute.