Dar kesim rahatsız değil; bilakis çok rahat.

Literally, dar means narrow / tight, and kesim means section / segment / group.

Together, dar kesim usually does not mean a physically narrow section. In context, it refers to a limited group, a small segment, or a narrow circle of people. It often appears in social or political language.

So dar here has the sense of limited rather than simply narrow.

Because Turkish often leaves out the present-tense copula to be in the 3rd person.

So:

• rahatsız değil = is not disturbed / is not uncomfortable
• çok rahat = is very comfortable / very much at ease

This is completely normal Turkish.
A more formal or emphatic version could be:

• Dar kesim rahatsız değildir; bilakis çok rahattır.

But in everyday and standard written Turkish, leaving it out is very common.

Değil is the standard way to negate noun and adjective predicates.

So:

• rahat = comfortable
• rahatsız = uncomfortable / disturbed / bothered
• rahatsız değil = not uncomfortable / not disturbed

It does not work like English not in every situation. Turkish usually uses:

• -me / -ma for negating verbs
• değil for negating nouns/adjectives

For example:

• gelmiyor = he/she is not coming
• hasta değil = he/she is not sick

They are closely related.

• rahat = comfortable, at ease, relaxed
• rahatsız = uncomfortable, uneasy, disturbed, bothered

The suffix -sız / -siz / -suz / -süz often means without.

So historically and structurally, rahatsız is like without comfort/ease, which gives the sense of uncomfortable or disturbed.

In actual usage, rahatsız can mean:

• physically uncomfortable
• mentally bothered
• socially disturbed/offended

The exact meaning depends on context.

Most likely emotionally bothered, disturbed, or troubled.

Turkish uses rahatsız very broadly. It can refer to:

• physical discomfort
• annoyance
• offense
• unease

In a sentence like this one, especially with the contrast bilakis çok rahat, it usually means something like:

• not upset
• not troubled
• not under pressure

and even more strongly, actually very comfortable / very at ease.

Bilakis means on the contrary, quite the opposite, or rather.

It is a real Turkish word, but it sounds somewhat formal, literary, or rhetorical. In everyday speech, many speakers would more naturally say:

• aksine
• tam tersine

So this sentence has a slightly more polished or emphatic tone because of bilakis.

Çok normally comes before the adjective or adverb it modifies.

So:

• çok rahat = very comfortable / very at ease

That word order is the normal one.

Also, rahat here is functioning as the predicate adjective of the clause. The full idea is:

• Dar kesim ... çok rahat
• The limited group ... is very comfortable / very much at ease

Again, the 3rd-person present is is simply omitted in Turkish.

Grammatically, kesim is singular. But semantically, it refers to a group of people.

This is very common in both Turkish and English:

• a group
• a segment
• a section of society

So even though it refers to multiple people, the noun itself is singular.

That is why dar kesim is perfectly natural.

Yes, but it changes the feel slightly.

• dar kesim sounds more like a general label or category
• dar bir kesim sounds more explicitly like a limited/small group

Adding bir often makes the phrase feel more like a certain group or one limited segment.

In many contexts, both are possible, but dar kesim can sound more idiomatic and compact, especially in analytical or political language.

The semicolon separates two closely connected parts with a strong contrast:

• Dar kesim rahatsız değil
• bilakis çok rahat

It works a bit like saying:

• not this; in fact, the opposite

A comma or dash could also be used in some writing styles, but the semicolon gives the contrast a more deliberate, written feel.

No, it is fairly normal.

The basic structure is:

• Dar kesim = subject
• rahatsız değil = first predicate
• bilakis çok rahat = contrasting second predicate

Turkish word order is flexible, but this version sounds neutral and natural. It presents the topic first, then gives the evaluation.

Yes. A more explicit and formal version would be:

• Dar kesim rahatsız değildir; bilakis çok rahattır.

Here, -dır / -dir / -dur / -dür adds a formal, assertive tone.

So the original sentence is natural and standard, while the -dır version sounds more formal, emphatic, or written.